US20060277187A1 - Location based data - Google Patents
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- US20060277187A1 US20060277187A1 US11/504,368 US50436806A US2006277187A1 US 20060277187 A1 US20060277187 A1 US 20060277187A1 US 50436806 A US50436806 A US 50436806A US 2006277187 A1 US2006277187 A1 US 2006277187A1
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- H04L63/0492—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload by using a location-limited connection, e.g. near-field communication or limited proximity of entities
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Abstract
A computer-implemented method and computer program product for providing data that includes location-based access control information concerning a data relay device located within a network infrastructure. The data relay device is loaded with one or more features, such that the one or more features loaded are dependent, at least in part, upon the location-based access control information.
Description
- This application is a continuation of and claims 35 USC § 120 priority to U.S. patent application Ser. No. 10/377,177, entitled “Location Based Data”, which was filed on 28 Feb. 2003.
- U.S. patent application Ser. No. 10/377,177 claims priority under 35 USC §119(e) to the following U.S. Provisional Patent Applications: Ser. No. 60/361,419, titled “A System for Network Definition Based on Device Location”, filed on Mar. 1, 2002; Ser. No. 60/361,421, titled “A System to Regulate Access as a Function of Device Location”, filed on Mar. 1, 2002; Ser. No. 60/361,420, titled “Systems and Methods to Define Location of a Network Device or a Networked Device”, filed on Mar. 1, 2002; Ser. No. 60/361,380, titled “A System and Method to Provide Security in a Network Based on Device Location Information”, filed on Mar. 1, 2002; Ser. No. 60/387,331, titled “Location Discovery and Configuration Provisioning Server”, filed on Jun. 10, 2002; and Ser. No. 60/387,330, titled “System and Method for Switch Based Location Discovery and Configuration Provisioning of Network Attached Devices”, filed on Jun. 10, 2002. The entire contents of each of these applications are hereby incorporated by reference.
- This application is also related to International Application Serial Number PCT/US03/06169, entitled “Location Aware Data Network”, which was filed on 28 Feb. 2003 and is herein incorporated by reference.
- This description relates to determination and use of location information within a data network.
- Computing systems are useful tools for the exchange of information among individuals. The information may include, but is not limited to, data, voice, graphics, and video. The exchange is established through interconnections linking the computing systems together in a way that permits the transfer of electronic signals that represent the information. The interconnections may be either cable or wireless. Cable connections include, for example, metal and optical fiber elements. Wireless connections include, for example infrared, acoustic, and radio wave transmissions.
- Interconnected computing systems having some sort of commonality are represented as a network. For example, individuals associated with a college campus may each have a computing device. In addition, there may be shared printers and remotely located application servers sprinkled throughout the campus. There is commonality among the individuals in that they all are associated with the college in some way. The same can be said for individuals and their computing arrangements in other environments including, for example, healthcare facilities, manufacturing sites and Internet access users. A network permits communication or signal exchange among the various computing systems of the common group in some selectable way. The interconnection of those computing systems, as well as the devices that regulate and facilitate the exchange among the systems, represent a network. Further, networks may be interconnected together to establish internetworks.
- The process by which the various computing systems of a network or internetwork communicate is generally regulated by agreed-upon signal exchange standards and protocols embodied in network interface cards or circuitry. Such standards and protocols were borne out of the need and desire to provide interoperability among the array of computing systems available from a plurality of suppliers. Two organizations that have been responsible for signal exchange standardization are the Institute of Electrical and Electronic Engineers (IEEE) and the Internet Engineering Task Force (IETF). In particular, the IEEE standards for internetwork operability have been established, or are in the process of being established, under the purview of the IEEE 802 committee on Local Area Networks (LANs) and Metropolitan Area Networks (MANs).
- In one implementation, a computer-implemented method includes providing data that includes location-based access control information concerning a data relay device located within a network infrastructure. The data relay device is loaded with one or more features, such that the one or more features loaded are dependent, at least in part, upon the location-based access control information.
- One or more of the following features may also be included. The one or more features loaded may include one or more configuration files and/or one or more network priorities. The location-based access control information may be dependent, at least in part, upon a transmission medium type (e.g., a cable-based transmission medium and/or a wireless transmission medium). The location-based access control information may be dependent, at least in part, upon a physical location of the data relay device. The data may include a computer file.
- In another implementation, a computer program product resides on a computer readable medium and has a plurality of instructions stored thereon. When executed by a processor, the instructions cause the processor to perform operations that include providing data that includes location-based access control information concerning a data relay device located within a network infrastructure. The data relay device is loaded with one or more features, such that the one or more features loaded are dependent, at least in part, upon the location-based access control information.
- One or more of the following features may also be included. The one or more features loaded may include one or more configuration files and/or one or more network priorities. The location-based access control information may be dependent, at least in part, upon a transmission medium type (e.g., a cable-based transmission medium and/or a wireless transmission medium). The location-based access control information may be dependent, at least in part, upon a physical location of the data relay device. The data may include a computer file.
- The details of one or more examples related to the implementations are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the implementations may be apparent from the description and drawings, and from the claims.
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FIG. 1 is a block diagram of an example system with location information; -
FIG. 2 is a block diagram of an illustrative process employing location information; -
FIG. 3 is a block diagram of another illustrative process employing location information; -
FIG. 4 is a block diagram of another illustrative process employing location information; -
FIG. 5 is a block diagram of another illustrative process employing location information; -
FIG. 6 is a block diagram of another illustrative process employing location information; -
FIG. 7 is a block diagram of another illustrative process employing location information; and -
FIG. 8 is a block diagram of another example system with location information. - Like reference symbols in the various drawings indicate like elements.
- 1.0 Overview (
FIG. 1 ) - Referring to
FIG. 1 , a location-aware system 100 operates and provides network-based services to users according to locations of devices that use or are part of the network associated withsystem 100.System 100 includes aninfrastructure 101 that includes multiple switching devices, some of which are connected to connection points (e.g., 160 a-i) ofinfrastructure 101.System 100 employs both hardware and software (e.g., an application executing on server 134) to provide location-aware services described below. A location of a device can relate to the physical location of the device, which can be characterized in a variety of ways including as grid or map coordinates (e.g., latitude, longitude, and elevation), a geographic region, or in terms of building structures, such as coordinates on a particular floor in a building or a room number in a building. A device can be external toinfrastructure 101 ofsystem 100, such asuser devices infrastructure 101, such as network entry devices 114 a-b (sometimes referred to as switches or edge devices of the network), and a central switching device 136 (e.g. a router). The network entry devices 114 can include and/or be associated with wireless access points 120 a-b. The wireless access points 120 can be individual devices external to the network entry device 114, such as 120 a and/or internal to the entry device 114, such as 120 b. - Some of the devices internal and external to
infrastructure 101 include a location module 185. The location module 185 includes functionality, as described in more detail below, that makes a device location-aware. In one example, this functionality includes a location database to store location information, protocol to communicate location information to other devices, and rules to enforce location-based policies (e.g., to enable policing based on location information). This functionality can also include the algorithms and processes necessary to determine the location of a device using the techniques described herein. Location module 185 can be implemented in the hardware and/or software ofsystem 100. For example, particular software applications executing on the devices can provide/enforce the location functions, the operating system of any of the devices can provide/enforce the location functions, and/or hardware modules, such as programmable arrays, can be used in the devices to provide/enforce the location functions. - To make use of a device's location,
system 100 first determines the location of that device.System 100 uses different techniques to determine the location of a device depending on whether the device communicates with other devices using a cable-basedtransmission medium 112, or awireless transmission medium 119. Cable-basedtransmission medium 112 refers to a constrained transmission medium such as an optical cable, an electrical wire, and the like. Such a cable transmission medium can provide single to many connections (shared) and/or a point-to-point (dedicated) connection between two devices. A cable-basedmedium 112 can be considered as part ofinfrastructure 101 ofsystem 100. Typically the medium 112 is installed in such a way that it is not easy to modify the medium's physical location. For instance, cables are lead through walls and conduits in such a way that the connection points (e.g., the jacks) are in fixed locations.Wireless transmission medium 119 refers to a transmission medium in a free space, such as though free air.Wireless transmission medium 119 generally relates to any communication where the transmission medium is air, for example, radio-based communication. For instance, radio communication according to the IEEE 802.11 standard uses awireless transmission medium 119. Other wireless communication using wireless transmission media relate to use of optical communication (e.g., infra red, lasers, and the like) and/or other communications through air such as acoustic and mechanical waves. Wireless media are characterized by a much greater range of possible locations in which communicating devices may be located. For example, in the case of an IEEE 802.11 based network, a mobile device may be able to communicate with a wireless access point 120 hundreds or even thousands of feet away depending on the environment. - In the illustrated
system 100 ofFIG. 1 ,user device 104 a connects toinfrastructure 101 usingcable 112 throughconnection point 160 a (e.g., a jack in a wall). Similarly, network entry devices 114 a-b andcentral switching device 136 connect to each other using a cable toconnection points 160 b-g. In a portion of a data network employing cables, a connection point (e.g., 160 a-g) is the terminus of the cable where a device physically attaches. A connection port (e.g., 113) is the physical port through which a network client communicates. - As described above, the connection points associated with a cable are generally fixed in location. The locations of these connection points are determined, for example, when the cable is installed. Location information includes an association of a connection point with its corresponding location.
System 100 stores the location information in location module 185. The location module 185 can store the location information using a location database. In an example of a centralized approach,system 100 stores the location information for all of the connection points of the network ofsystem 100 inlocation module 185 a inlocation server 134. In an example of a distributed approach, described in more detail in the alternatives section below,system 100 stores the location information for all of the connection points, or a portion of the connection points, in each of the location modules 185 a-d. In one approach to determining the location of a device,system 100 determines the connection point (e.g., 160 a-g) through which the device is connected tonetwork infrastructure 101 and finds the stored location information in location module 185 corresponding to that particular connection point. - A device using
wireless transmission medium 119 connects toinfrastructure 101 through connection points 160 h-i, for example communicating from the device's transceiver to the wireless access points 120 a-b of network entry devices 114 a-b, respectively. These wireless connection points 160 h-i, similar to connection points 160 a-g, are also generally fixed in location. The location of a user device 104 connected to awireless connection point 160 h-i, however, can be dynamic. The location ofuser device 104 b changes asuser device 104 b moves. Stationary wireless connection points 160 h-i may no longer be in communication withuser device 104 b asuser device 104 b moves away, thus no longer being connection points for 104 b after a certain period of time. - In one approach to determining a location of a device using
wireless transmission medium 119,system 100 determines the location ofuser device 104 b relative to typically multiple network devices (e.g., 120 a and 120 b) that receive transmitted signals fromuser device 104 b.System 100 uses signal characteristics, such as relative time delay or signal strength of the signal received at the different network devices in combination with the known location of the wireless access points 120 a-b.System 100 optionally uses other known boundaries, for example walls within a building, to further limit the location of an area, relative to the wireless connection point (e.g., 120 a or 120 b), within which that user device 104 is operating.System 100 stores the location information corresponding towireless user device 104 b in association with one or more of the connection points 160 h-i in location module 185 (e.g., 185 a in an example of a centralized approach). Thesystem 100 updates the corresponding location information asuser device 104 b moves. - Having determined the location of a device,
system 100 employs that location information in a variety of ways.System 100 can provision and configure devices withininfrastructure 101 or external toinfrastructure 101 according to their locations as devices are added or moved. This enables a network device, in an automated fashion, to learn of its location and based on its location, configure itself, operate in a certain manner and enforce certain location-based rules. For example,network entry device 114 a can be replaced with a new network entry device that, once connected, learns its location, and its configuration and rules of operation based on that location, in an automated fashion fromlocation server 134. -
System 100 is able to enforce certain restrictions, on an initial and continual basis, based on locations of devices.System 100 can restrict access to the network or data stored on the network based on the location of user device 104. For example,system 100 restricts access to accounting databases to only user devices 104 located within the accounting department offices (e.g., within certain coordinates of a certain floor of a certain building). Further,system 100 can also periodically and/or continually police these restrictions so that a user device 104 cannot authenticate based on being in one location, and then try to access restricted services at another unauthorized location based on that authentication. Location can also be another parameter, for instance in addition to a user identification or a device type, that is used for allocation of network resources, such as speed and quality of service (QoS). -
System 100 also restricts flow of data throughinfrastructure 101 based on location restrictions of that data. For example, thesystem 100 can restrict data from the accounting databases to stay within the accounting department offices (e.g., an area defined by certain coordinates). In one approach to implement such restrictions, the data has a tag that contains the location restrictions (e.g., permitted and/or prohibited locations). For example, the application generating the data and/or the server generating a data packet to transport the data over the network can add this tag while generating the data and/or packet. Devices and applications withinsystem 100 enforce those restrictions by not allowing the data to be routed to a device outside of the permitted location, by destroying the data if it is in a location outside of the permitted location, and/or denying access to (e.g., reading, opening) the data outside a permitted location. -
System 100 is also able to provide other services and applications that employ the location information. For example,system 100 can use the location information in emergency situations, where a device may be an alarm or sensor.System 100 determines the location of the alarm device and transmits the location information to a party responding to the alarm.System 100 can also use location information to recover a stolen user device 104. As the stolen user device 104 accesses the network,system 100 determines the location of the stolen device and transmits the location information to a party seeking to locate the device.System 100 can track mobile user devices (e.g., 104 b) and thus can also track anything associated with that user device (e.g., the user, a file, a physical object, and the like).System 100, through the use of location information, can provide these and other services and applications. The sections below provide more detailed examples of the devices and techniques described in the above overview. - 2.0 Locating Devices Overview (
FIGS. 1, 2 , and 3) - In determining the location of a device,
system 100 employs one or more of a number of mechanisms/techniques so that location information can be verified and trusted bysystem 100. One general characteristic of these mechanisms is that devices or applications withininfrastructure 101 do not necessarily trust devices outsideinfrastructure 101, even if those outside devices declare that they are at certain locations. That is, the determination of the location of a device is preferably based on information that is obtained directly bysystem 100 usingnetwork infrastructure 101, rather than supplied by a device itself.System 100 uses various approaches to obtain information to use when determining the location of a device communicating with the network, with some specific approaches being applicable to cable-based or wireless transmission media. - In general overview, for wireless devices (e.g., devices communicating via a wireless transmission medium),
system 100 maintains information that is used to locate the devices based on the characteristics of wireless communication between typically multiple devices (e.g., 120 a and 120 b) innetwork infrastructure 101 and a wireless user device (e.g., 104 b). Generally this approach is referred to as triangulation, with the understanding that this includes all varieties of remote location determination and approximation including those based on variations in time delay, signal strength, and directionality of signals based on the location of a wireless device, and including both analytical or model-based approaches as well as approaches that are based on prior measurement and recording of transmission and propagation characteristics at various locations. - For devices connected via cable,
system 100 maintains information that characterizes the locations of the cable connection points, for example in a location database stored in location module 185. Such a database is populated and maintained in a variety of ways. For example, oncenetwork infrastructure 101 has been physically arranged, a survey of all the cable connection points can be undertaken to record the physical location corresponding to each cable connection point 160 and its corresponding connection port innetwork infrastructure 101. Then, as a device or the network infrastructure identifies a cable connection point 160 to which the device is connected,system 100 uses the location database to determine the location corresponding to the identified connection point. The connection points are identified using a unique connection point ID. The value of the connection point ID can be, for example, a number, a text string, or a combination of infrastructure pertinent information. - After determining the location of a device using one of these techniques, in one
example system 100 maintains the location information centrally on thelocation server 134 in the location database inlocation module 185 a. In the case of wireless devices,system 100 dynamically modifies the location of the device stored in the location database as the device moves.System 100 can track the user device itself, and/or the closest network entry device (e.g., 114) through which the wireless user device communicates. With the devices that communicate via a cable,system 100 updates the location database if and when a device is moved from one cable connection point (e.g., wall jack) to another. The devices communicate the location information to each other using a protocol using layer 2 (the data-link layer) or layer 3 (the network layer) of the Open Systems Interconnection (OSI) communication model. For example, the devices communicate with each other using IP version 4. Other layers and protocols can also be used. Additional and alternative mechanisms for locating devices are described further below in the alternatives section. - 2.1 Techniques for Determining Location of Connection Points (
FIG. 1 ) - Following below are examples of more detailed mechanisms/techniques to determine the location of the connection points, thus determining the location of the devices employing those connection points. The detailed descriptions of various mechanisms are divided into those mechanisms most applicable to wireless connections (i.e., connections using a wireless transmission medium) and those mechanisms most applicable to cable connections (i.e., connections using a cable-based transmission medium), although in general, mechanisms may be applicable to both types of connections. There can be examples when the mechanisms can be applicable to other types of connections (e.g., mechanisms for cable connections can be applicable for wireless connections).
- 2.1.1 Wireless Connections (
FIG. 1 ) - Referring now to some detailed techniques for wireless connections, as described above, two example types of wireless communication chosen to illustrate these techniques are via radio frequencies or infrared frequencies.
System 100 can employ different mechanisms for each of these types of communication.System 100 can employ a first group of mechanisms/techniques for identifying the location of a device (e.g., 104, 114) that communicates via radio frequencies. For example,system 100 triangulates the location of a device using one or more wireless access points, such as 120 a-b, associated with network entry devices 114, such as 114 a and 114 b, respectively, as shown inFIG. 1 . As another example,system 100 determines a device's location based on the proximity to an entry device. Following below is a listing ofvarious techniques system 100 can employ to determine the location of a wireless device. -
System 100 can employ a number of known triangulation techniques, including the use of signal strength, angle of arrival, and relative time delay approaches.System 100 can employ off-frequency searching, such as by frequency hopping for short periods of time to detect stations on frequencies alternate to that employed for data exchange. For example, wireless access point 120 a can operate at a first frequency f1. Wireless access point 120 b can operate at a second frequency f2. Periodically, and for a relatively short period of time, wireless access point 120 a operates at the second frequency f2 to detect and determine signal characteristics of a device communicating with wireless access point 120 b. Similarly, wireless access point 120 b periodically and for a relatively short period of time operates at the first frequency f1 to detect and determine signal characteristics of a device communicating with wireless access point 120 a. -
System 100 can employ phased-array searches for lobe-based triangulation. That is, a radio antenna of the network entry device is directed to maximize or at least optimize lobe location as a search beacon. Such lobeing or lobe steering may be a staged process in which network entry devices 114 make broad sweeps to get rough location information, which may be sufficient in some situations. Network entry devices 114 can fine-tune the sweeps, if desired, with narrower lobes, to get a more accurate location.System 100 also can conduct phased-array antenna searches at off-frequency conditions (e.g., frequency hopping combined with directional searching). -
System 100 can perform calculations to approximate distance from a known access point (e.g., 120 a-b) as a function of signal strength attenuation (e.g., the signal is at x strength so the device must be located in a range of y-z feet away). In addition to calculations,system 100 can also search stored associations of signal characteristics and their corresponding locations. This information can be stored in a signal characteristic database. A network administrator generates this signal characteristic database by measuring predefined signal characteristics at different locations and storing the measured characteristics for each of the locations. When subsequently determining a location of a user device, ifsystem 100 detects a signal characteristic identically corresponding to a location,system 100 determines that the user device is at that corresponding location. If the signal characteristic is not identical,system 100 can use multiple entries within the database to extrapolate the user device location information based on the stored signal characteristic and location associations. This technique is sometimes referred to as RF training. - Using multiple frequencies and/or connection-points and/or antennas may improve the accuracy of location derivation techniques. For example, if the same access point is used at different frequencies,
system 100 can use the error in location information among the different frequencies to infer location more accurately. In addition, the use of multiple access points (e.g., signals fromuser device 104 b received at 120 a compared with signals received at 120 b) may improve relative location accuracy in a type of triangulation or averaging of signal strength indicators.System 100 can employ multiple antennas for that purpose. Multiple antennas (not shown) may also be used to assert a line of bearing. In that case, the relative separation of the antennas and the accuracy of the known spacing both may provide improved location accuracy.System 100 also can employ ultra wide band waves to determine relative location of one or more devices. As the accuracy of the location derivation increases by using these improved techniques,system 100 can assign a higher value for the level of trust parameter associated with that location. -
System 100 also can use signal amplitude differential from thenetwork entry devices user device 104 b with respect to an antenna onnetwork device System 100 can combine techniques, such as using signal amplitude differential combined with the phase differential techniques described above to determine location. The location techniques described are not limited to any specific type of antenna technology.System 100 can employ an antenna associated with a wireless access point 120, or an antenna associated with a stand-alone device, including, but not limited to, a personal digital assistant or a laptop computer, designed to relay information to a network-related device employed to calculate relative location from received data. One or more antennas can be deployed in one or more wireless access points 120.System 100 can also vary and limit the transmission strength of the wireless access points 120, so thatsystem 100 can determine and control a radius of relative location based on the radius of operation due to the limited transmission strength. This relative location can be further limited from the radius of operation by other physical barriers such as walls and non-accessible locations within the radius of operation. -
System 100 also can employ a second group of mechanisms for identifying the location of a wireless device (e.g., 104, 114) that communicates via optical technology, such as infrared light waves and lasers. More specifically, the use of an infrared transmitter and receiver can limit the actualdistance user device 104 b can be from anetwork entry device system 100 determines a relative position ofuser device 104 b using that maximum distance limit as a radial boundary fromnetwork entry device system 100 can use physical barriers, such as walls, to limit the determined boundaries of the allowable locations of the infrared device. -
System 100 uses the techniques above for radio and infrared communications to determine the location of a wireless device. As described in more detail below,system 100 may use the above techniques to determine the absolute location ofwireless user device 104 b itself, or use the above techniques to determine a relative location, determining whetherwireless user device 104 b is closer to wireless access point 120 a or 120 b and using other known parameters, such as transmitter strength and physical barriers. The location information gathered by system 100 (e.g., via access points 120 a and 120 b) using the above techniques may be considered trusted information if the network-controlled devices (e.g., access points 120 a and 120 b) collecting the information are trustworthy. The devices are considered trustworthy if, for example, they are part ofinfrastructure 101 and cannot be accessed, moved, and/or modified by anyone except authorized network administrators. Instead of receiving a location from a wireless device and relying on that received information as accurate,system 100 verifies the location of a device itself using one or more of the above techniques. Determining location information for an authenticated user by trustworthy devices (e.g., a device withininfrastructure 101 that cannot be altered) enablessystem 100 to assign to the location information a higher value for the level of trust and enables greater security in the permitted access tosystem 100 as described in more detail below. - 2.1.2 Cable Connections (
FIG. 1 ) - Referring now to some detailed techniques/mechanisms to determine a location of a device using cable connections,
system 100 can search locations of connection points previously stored in a location database and/orsystem 100 can use characteristics of signal propagation through a cable-based transmission medium. In one example,system 100 searches a location database to find the location of a connection point to which a device is connected. The database is located in location module 185 oflocation server 134. As described below,system 100 assigns a unique identifier to each connection point 160. When a device connects tosystem 100,system 100 determines the unique identifier of the cable connection point to which that device is connected.System 100 searches the location database to find the connection point with that unique identifier and uses the location that corresponds to that connection point. To use this technique, the location database is populated when the cable connection points are installed and/or when the connection points are first used. - The process to generate the database can be manual and/or automated. In an example of a manual process, a network administrator enters the unique identifier for each connection point and its corresponding location in the location database. For example, the network administrator uses a map (e.g., floor plan, office layout, and the like) to determine the location information of each of the installed connection points. The location information obtained from the map and entered into the location database can include coordinates of the connection point (e.g., lat 42°, long 48°), a string description of the connection point (e.g., room ten, first floor, building one) and the like.
- In an example of an automated process,
system 100 uses user device 104 with its own location determining system (e.g., GPS) to providesystem 100 with location information as user device 104 is connected at each connection point 160. Thesystem 100 can employ a trusted user device (e.g., a user device with no/low probability of providing false location information or always under control of a network administrator) or an untrusted user device (e.g., a device not under the control of the network administrator). - With an untrusted user device,
system 100 can attempt to independently verify the location information received from the untrusted device. For example, if the untrusted device can use both cable-based and wireless transmission media (e.g., a laptop with a network card and a wireless transmitter or infrared port),system 100 can use one or more of the wireless techniques above to verify the location of the device while the device communicates using a cable connection point.System 100 can also use one or more of the signal characteristic techniques below to verify the location of the device while the device communicates using a cable connection point. - With a trusted user device with its own location determining system, as
system 100 determines the connection point to which the trusted user device is connected and receives the location determined by that trusted user device, thesystem 100 adds an association of the connection point and its corresponding location to the location database. When the trusted user device connects to additional connection points,system 100 populates the location database further until all connection points have corresponding locations. In the association,system 100 can use a unique identifier to identify each of the connection points. - In another example of an automated process,
system 100 employs a trusted user device 104 with its own location determining system that can work in the absence of GPS data.System 100 employs a user device with standards-based LAN connectivity capabilities. The user device is capable of determining an absolute 3-dimensional position via GPS and also has the capability, likely via an inertial navigation system, to determine its absolute position in the absence of GPS data. An inertial navigation system may be preferred because the GPS uses very low power transmissions from the satellites and reception indoors or even outdoors in heavily developed areas may be poor or non-existent. Ifsystem 100 provides a start or reference position to an inertial-based system, that system can maintain very accurate 3-dimensional location datum with no external information. In addition to the starting position,system 100 can provide a security feature to the user device to ensure that its location information is trustworthy. This can include, for example, keys and laser techniques. The user device calculates absolute position information, and has the capability to format that information for IP transport over a LAN via its LAN interface. An operator can go to a port providing access to the LAN, connect the trusted user device to that port, and command that the current location information derived by the user device be sent to the location database in thelocation server 134. Upon receipt of that information,system 100 updates the location information in its location database for that connection point. - In another example, as described in more detail in the alternatives section, a trusted third party can act as an agent to provide the location of
connection point 160 a. For example, if the connection point 160 is a telephone jack in a user's home, the corresponding telephone number can be used as a connection point ID. The telephone company can act as a trusted agent and provide a location (e.g., residential address) of that connection point.System 100 assigns a value for the level of trust parameter associated with that location information based on the trustworthiness of the source, as described below. Themore system 100 trusts the third party agent, for example the phone company, the higher level oftrust system 100 associates with the provided location information. - As an alternative or in addition to the predefined database,
system 100 can use characteristics of signal propagation through a cable-based transmission medium to determine the location of a device. More specifically,system 100 can use a characteristic of a signal that varies with the length of the cable-based transmission medium (e.g., time delay, time-domain reflectometry (TDR) techniques, signal attenuations, round-trip delay and the like) to determine the length of cable through which the signal is traveling. For a connection point,system 100 measures the particular signal characteristic and based on that measurement,system 100 determines the length of the cable. As described above for wireless connections,system 100 employs a lookup table, database, and/or function that relates the characteristic measurement to a location for cable connections also. Data for the signal characteristics (e.g., round-trip training for cable-based media) can be performed at the same time connection points 160 are being mapped with a trusted GPS, as described above, so that location is not based solely on estimating delay. - For example, a signal characteristic database contains the association that a measured time delay of a signal corresponds to a specific length of cable from the
network entry device 114 a.System 100 determines a relative position ofuser device 104 a using that determined cable length as a maximum distance fromconnection point 160 a by accounting for (e.g., subtracting) the length ofcable 112 included in the infrastructure. Further, as described above,system 100 can use physical barriers, such as cable runs and walls, to limit the determined boundaries of the allowable locations of theuser device 104 a. This technique is useful in determining whetheruser device 104 a is connected toconnection point 160 a using a long length of cable, thus allowinguser device 104 a to be located a substantial distance away from theconnection point 160 a (e.g., in a different, and perhaps unauthorized, room). For example,system 100 determines, using signal characteristics as described above that there is 10 feet of cable betweenuser device 104 a andnetwork entry device 114 a.System 100 has information that the cable length fromconnection point 160 a to 114 a is 7 feet and is fixed (i.e., runs through a wall and cannot be modified). Using this combined information,system 100 determines that the length of cable fromconnection point 160 a touser device 104 a is 3 feet and so theuser device 104 a is confined to the room in whichconnection point 160 a is located. - The use of signal characteristics also enables
system 100 to determine which connection point a user device 104 is connected to for cables with multiple connection points (e.g., 104 i and 104 j,FIG. 8 ). For example,system 100 can use a calculated cable length to determine which of the connection points user device is within the range of the cable length. Once a connection point is identified,system 100 can obtain its location via the location database and then determine the location of the user device 104. It may be the case thatsystem 100 identifies multiple connection points within the range of the cable length. It some instances, this may still be enough to authenticate the location, as described in more detail below. For example, the cable length may indicate that the user device is connected to one of the connection points in conference rooms 1-5 on the second floor. All of the conferences rooms, however, are in permitted locations for the requested network resources, so this granularity and precision is acceptable for authentication in this case. - 2.2 Location Information Database (
FIG. 1 ) - As described above for both wireless and cable-based transmission media,
system 100 maintains and updates the location information associated with the connection points (e.g., 160 a-i) of thesystem 100 in a location database. The information included in the location database can vary. For example, Table 1 is a table containing the type of information that can be included in the location database. As illustrated in Table 1, each row represents an association between a connection point and its corresponding location in one or more formats. The “Connection Point ID” column contains the unique identifier associated with a particular connection point. The connection point ID can be any ID that uniquely identifies a connection point. As described in more detail below and illustrated in Table 1, in one example the combination of a device Media Access Control (MAC) address (e.g., 00001d000001) and a port MAC address within the device (e.g., 00001d000101) determines the connection point ID. The locations contained in Table 1 are included in two format types for each connection point ID. The first type is an American National Standards Institute (ANSI) Location Identification Number (LIN) and the second type is a coordinate of latitude and longitude. (Some additionalexample formats system 100 can employ are described in the alternatives section below.) - The location information of Table 1 additionally includes the optional parameters “Level of Trust” and “Device ID”. The level of trust, as explained in more detail below, is a parameter with a value in a predefined range, where the range represents the trustworthiness of the location reference. The level of trust generally corresponds with the trustworthiness of the source providing the location of the connection point. A higher level of trust value represents a higher level of confidence that the location reference is accurate, reliable and has neither been altered or generated falsely to gain normally unauthorized access. The device ID uniquely identifies the device that is connected to the connection point. The device ID information enables
system 100 to store a map of the physical locations of all the network devices (e.g., 104, 114, 136). This is beneficial if there are devices associated withsystem 100 that are not configured to acquire and/or store their location information.System 100 can use this corresponding device information to enablelocation server 134 to transmit location information to a location-aware application since the device cannot transmit the location information itself. IN other words,system 100 can act as a third-party verifier for applications requiring verified location information. Table 1 can include other information in addition or as an alternative to the device ID. For example, Table 1 can include MAC address, address, phone number, protocol type, asset ID, owner and/or the like.TABLE 1 Location Location Location Location Level of Connection Point ID ID Type Reference ID Type Ref. Trust Device ID 00001d000001:00001d000101 ANSI LIN xxxxxxxxxx1 Lat-Long x1° by y1° 2,256 Model: ABC 00001d000001:00001d000102 ANSI LIN xxxxxxxxxx2 Lat-Long x2° by y2° 2,256 S/N: 1233 00001d000001:00001d000103 ANSI LIN xxxxxxxxxx3 Lat-Long x3° by y3° 2,256 GUID: A82C 00001d000001:00001d000104 ANSI LIN xxxxxxxxxx4 Lat-Long x4° by y4° 2,256 00001d000001:00001d000105 ANSI LIN xxxxxxxxxx5 Lat-Long x5° by y5° 2,256 00001d000001:00001d000106 ANSI LIN xxxxxxxxxx6 Lat-Long x6° by y6° 2,256 00001d000001:00001d000107 ANSI LIN xxxxxxxxxx7 Lat-Long x7° by y7° 2,256 00001d000001:00001d000108 ANSI LIN xxxxxxxxxx8 Lat-Long x8° by y8° 2,256 00001d000001:00001d000109 ANSI LIN xxxxxxxxxx9 Lat-Long x9° by y9° 2,256 00001d000001:00001d000110 ANSI LIN xxxxxxxxx10 Lat-Long x10° by y10° 2,256
2.3 Specific Examples of Locating Devices (FIGS. 1, 2 , 3, and 8) - As described above, once the location database is established,
system 100 can provide the location information to a device when that device connects to a connection point. This can include providing location information to devices outside ofinfrastructure 101 as well as devices withininfrastructure 101.FIGS. 2 and 3 illustrate additional examples ofsystem 100 locating devices.FIG. 2 broadly illustrates thesteps system 100 performs, from discovering a device's connection tosystem 100 to allowing the device access to the network.FIG. 3 illustrates more specifically thesteps system 100 performs to determine the location of the discovered device. In other words,FIG. 3 shows a portion of the steps ofFIG. 2 in more detail. -
FIG. 2 broadly illustrates an example of a sequence ofsteps system 100 performs, from discovering a device's connection tosystem 100 to allowing the device access to the network. Referring to the example location identification process 201 ofFIG. 2 ,system 100 activates or otherwise discovers (step 210) a device destined for a network association, or a device already network associated.System 100 queries (step 215) the device for location information. That location information may be of absolute or relative type. If location information does not exist,system 100 queries (step 220) whether the device can identify its own location. If the location information does exist, or the device can provide a trustworthy location,system 100 establishes (step 230) the device location information. A location is trustworthy, for example, if thesystem 100 assigns a level of trust value for that location that is above a predefined threshold. The predefined threshold can vary depending on the network resources that the device requests. For example, sensitive information and applications require a much higher threshold than access to public information. - If the device cannot provide its own location information, or the location information is not associated with a level of trust acceptable to
system 100 for the particular transaction requested, the location information is determined (step 225) independently of the device, bysystem 100 itself or a trusted third party agent. After determining (step 225) a trustworthy location,system 100 establishes (step 230) the device location information. - Whether
system 100 can trust the location information from a device (e.g., associate a high enough level of trust value with the location) can depend on the source of that location information. For example, if the location information came from a secure device withininfrastructure 101 not vulnerable to modification,system 100 can trust the location information and assign a the location information a high level of trust value. If the location information came from a GPS and/or has been verified by a third party certificate with security features allowing for a low level of probability of providing a false location,system 100 can trust the location information, but with a lower level of trust value than if the location information came fromsystem 100 itself. The range of level of trust values is described in more detail in the restricting access section below. - In one example where
system 100 determines (step 225) the location of a device, thus assigning a high level of trust value to that location, the device receives connection information from a network entry device (e.g., 114 a, 114 b). The connection information includes information that the network entry device has, such as a network entry device identifier and a port number of the network entry device to which the connection point is connected. The device transmits the received connection information, or a portion thereof, tosystem 100, or more specifically, to a portion of the network maintaining the location information database (e.g., location server 134). Using the received information (e.g., network entry device identifier and port number),location server 134 determines the connection point to which the device is connected. Referring to the unique identifier of that connection point, which in one example could be the combination of the network device identifier and port number,location server 134 retrieves the location associated with that connection point.Location server 134 transmits to the device the location information associated with the connection point. - Continuing with process 201,
system 100 optionally confirms (step 235) a predefined list of additional parameters, either through a database search or a table update.System 100 may employ that predefined list of parameters to define network access as described below. The predefined list of parameters may include, but is not limited to, the device port number of the connection, traffic activity and link information, MAC address, IP address, a timestamp, and activity staleness. Upon satisfaction bysystem 100 that the appropriate predefined list of parameters and device location information has been gathered (step 235),system 100 permits (step 240) network access. As described below, the location information may be used as a supplement to existing network usage control means, such as NOS, RADIUS, IEEE 802.1X, IEEE 802.1Q, firewalls, and QoS mechanisms. Further,system 100 continually polices against these mechanisms to ensure that network usage does not go beyond the bounds set by parameters defined within these mechanisms, including location restrictions for devices and/or data. - In general, in alternative sequences of steps,
system 100 establishes a device location and a level of trust of that established location based on a combination of multiple inputs, including location information included in the device itself (e.g., step 215), location information identified by the device (e.g., step 220), and location information gathered independently of the device (e.g., step 225), without necessarily following the sequence shown inFIG. 2 . - In addition,
FIG. 2 shows a single sequence of steps to determine a location of a device and to act on that determined location. In general, this process, and other processes involving determining or verifying device locations that are described below, may be repeated while the device is connected to the network for any of a number of reason of interest to the network admin that re-determining location is required, including in the event of a detected attack, when new information about the device's location becomes available, periodically, or based on an internal or external network events or other matters of network policy. This repetition of the process provides an ongoing policing function. For example, such a policing function can be used so that a device cannot be established at one physical location, and then moved to another physical location where its privileges may be different. - As introduced above, a wide variety of events may initiate the process of determining and validating the location of a device. These can include, but are not limited to: a timer expiring, a communication link being broken, a communication session terminating, a change in a user's credential, triggering of a firewall alarm, a new network device joining the network, prompting by a management station, particular movement of a device is detected, a shadow (users or devices of network) device is detected.
- Referring to
FIG. 3 ,example process 300 illustrates thesteps system 100 performs to determine the location of the discovered device. For clarity and example only, some portions ofexample process 300 refer to a location server and a location client. A location server refers to a device ofsystem 100 comprising functionality in location module 185 that enables that device to provide location information to another network device. This can include hardware and/or software applications for the storage of location information parameters, access to the storage devices containing values for parameters, algorithms and processes to determine the location of a device and other like functionality. Additionally, location module 185 of a location server may be further configured to provision operational configuration parameters based on the location of the network-attached device, as illustrated in the optional steps ofFIG. 3 . A location client refers to the device for which the location server is trying to determine location. The network entity ofFIG. 3 represents an intermediary device that includes the access port through which the location client communicates. - Referring to
FIG. 1 , for an example where the location client isuser device 104 a, the network entity ofFIG. 3 is thenetwork entry device 114 a, which hasconnection port 113 through which theuser device 104 a communicates. For an example where the location client isnetwork entry device 114 a, the network entity ofFIG. 3 is theswitching device 136, which has theconnection port 165 through whichdevice 114 a communicates. As these two examples illustrate,network entry device 114 a can act as both a location client and an intermediary device. In a distributed example described in the alternatives section below,network entry device 114 a also can act as a location server, thus combining the network entity and the location server ofFIG. 3 into a single device. - Referring to process 300, the network entity (e.g., 114 a) transmits (step 305) connection information (e.g., in the form of data packets) to the location client (e.g., 104 a) that allows for the detection of a unique connection point ID. This connection information can represent the port to which the connection point is physically connected. The connection information can be in a format compliant with many different protocols. The location client receives (step 310) the connection information and determines (step 315) a connection point ID. For example, the location client can extract the connection point ID from one of the example packet types.
- For illustration, a specific example employs IEEE Spanning Tree Bridge Protocol Data Unit (BPDU). In an IEEE 802.1 D Spanning Tree BPDU example, every switch port with spanning tree enabled will forward (step 305) a BPDU at regular intervals. A BPDU comprises the following information: (i) the primary MAC Address of the transmitting switch (bridge ID); (ii) the identifier of the transmitting port (the MAC address of the switch port sending the BPDU); (iii) the unique bridge ID of the switch that the transmitting switch believes to be the root switch; and (iv) the cost of the path to the root from the transmitting port. The location client receives (step 310) the IEEE spanning tree BPDU and decodes the unique bridge ID and transmitting port ID as its connection point ID. Using that decoded information, the location client determines (step 315) that the connection point ID={Bridge ID MAC Address}+{Transmitting Port ID MAC Address}. Alternatively, the location client forwards these received parameters to the location server and the location server generates the connection point ID by combining the applicable parameters, as described in
FIG. 2 . - It can be seen that this approach may be applied to other discovery protocols and techniques, with modification dependent upon specific protocol formatting. Also,
system 100 can employ other unique identifiers. For example and referring toFIG. 8 , foruser device 104 h, which is connected tosystem 100′ through atelephone network 132,system 100′ can employ a phone number to uniquely identify theconnection point 160 k (e.g., phone jack) to which theuser device 104 h is connected. Similarly, user device 104 g can be a personal computer connected toInternet 148 via a cable modem that has been assigned a unique IP address.System 100′ can employ this unique address, alone or in combination with an ISP identifier, to uniquely identify the connection point 1601 (e.g., a jack or the end of a cable for a cable modem) associated with user device 104 g. - In
process 300, the location client transmits (step 320) the connection point ID to the location server. The location server determines (step 325) location information for the location client based on the connection point ID. The location information can be defined in a location database within the location server as described above or discovered from thenetwork infrastructure 101′ using the techniques described above. - After determining (step 325) the location information, the location server transmits (step 330) the location information to the location client. If configured to do so, the location client stores (step 335) the location information for future reference. In addition to the location, the received data may include a corresponding level of trust value associated with the origination of the location information. The location information, and any additional information, may also be protected with a security feature. For example, the information may be encrypted with a temporary key associated only with the particular connection point to which the location client is connected.
- To determine (step 325) location information, the location server employs a location database comprising connection point ID information and geographic information. An advanced location server can also act as a device registry and can map unique identifiers of the devices (e.g., 104, 114) to their corresponding connection point and geographic information, as illustrated in Table 1 above. As illustrated in
FIG. 3 , the location server can optionally store (step 340) the location information in a storage module on the network entity. In another example, the network entity storage module and the location database can be the same. Thus, more than just a topology, the location server stores and/or has access to information with the physical locations of the mapped devices. - Referring to process 300, the location client counts (step 320) a predefined amount of time to resend (step 320) its connection point ID information to the location server periodically to ensure the accuracy of the location information. The location server sends (step 330) the location information to the location client after referencing (step 325) the connection point ID that was previously sent by the location client. This periodic verification is one example of
system 100 periodically policing location information. Or in other words, periodically verifying that the location client has not changed locations. - Also shown in
process 300 are theoptional steps - After
system 100 authenticates the location information and optionally configures devices based on their location,system 100 continually polices the network at the edges ofinfrastructure 101 to ensure that policies regarding location information are enforced. The steps 365, 370, 375, and 380 ofprocess 300 illustrate an example of edge policing bysystem 100. For example, when the location client requests (step 365) additional resources, the network entity (e.g., in the case of edge policing, network entry device 114) verifies (step 370), using any of the techniques described herein, that the location client is still at the same location as when the client was authenticated. If not, the location client is forced to repeat the authentication process at the new location. In response to a request for data, the location server, or another server and/or application on the network, transmits (step 365) the requested data to the location client via the network entity. As described in more detail below, the network entity determines whether there are any location restrictions on the data. If so, the network entity enforces (step 380) those location restrictions by, for example, not forwarding the data to the location client if the location client is at a prohibited location. As illustrated, the network entity polices both incoming requests and outgoing data in accordance with location based policies. - 3.0 Network Operation Using Device Location (
FIGS. 4, 5 , 6, and 7) - As illustrated in the optional steps of
FIG. 3 , oncesystem 100 determines the location of a device,system 100 can employ that location information to provide some automated operations. In other words, a network that is location-aware enables the utilization of information stored on a location client and/or in the location database to enhance the operation of the location-aware network. Becausesystem 100 is able to learn the connection point to which any device is connected using the techniques above,system 100 can provide automated management based on the locations associated with those connection points. The operations and services that thesystem 100 provides for automated management based on location information vary. Some techniques/mechanisms are described below in more detail. - 3.1 Provisioning and Configuring
- One type of automated mechanisms involves the provisioning and configuration of devices as they are added to
system 100. When added,system 100 determines the location of the added device and then based on that location,system 100 determines, for example, what particular configuration file should be loaded into the device, what type of network priorities the device should be assigned, such as bandwidth, latency, QoS and other like network policies. This mechanism enablessystem 100 to enforce any of these policies based on the location of each device. The examples that follow illustrate howsystem 100 can expand data within the location database to include the provisioning and/or configuration data. - 3.1.1 Provisioning/Configuring Examples Using an Expanded Location Database
- In one specific example of provisioning, a location server assigns location information and network specific configurations to Voice over IP (VoIP) handsets. The information is provisioned on the phone and includes, for example, Virtual LANs (VLANs) ID, traffic prioritization at layer 2 or layer 3, and an E911 LIN. This simplifies the information on VoIP phones in branch offices, for example. The provisioned parameters are added to the location information in the location database of the location server. An expanded location database for VoIP phone environments can include the following information: VLAN membership of the voice entity, layer 2 priority mappings for voice payload/voice control/non voice traffic, layer 3 class of service markings for voice payload/voice control/non voice traffic, location client's network layer address, ANSI LIN numbering, geographic location information including latitude, longitude, altitude and accuracy factor, device microcode file to boot (e.g., bootp server pointer), and/or other like parameters. Table 2 is a table containing an example of the type of information that can be included in an expanded location database that includes additional provisioning parameters for a VoIP network. In addition to the connection point ID and the location reference, the location database represented by Table 2 also includes a voice VLAN ID and a voice priority parameter. As described above, the location database also can include device ID data about a location client. In the VoIP example, these optional device ID parameters can include the handset extension number, the handset model number, the handset version, the handset network address, and/or the like.
TABLE 2 Location Location Voice Voice Device ID Entry Connection Point ID ID Type Reference VLAN ID Priority (optional) 1 00001d000001:00001d000101 ANSI LIN xxxxxxxxxx1 101 5 extension: 7082 2 00001d000001:00001d000102 ANSI LIN xxxxxxxxxx2 101 5 model: 123 3 00001d000001:00001d000103 ANSI LIN xxxxxxxxxx3 101 5 4 00001d000001:00001d000104 ANSI LIN xxxxxxxxxx4 101 5 5 00001d000001:00001d000105 ANSI LIN xxxxxxxxxx5 101 5 6 00001d000001:00001d000106 ANSI LIN xxxxxxxxxx6 101 5 7 00001d000001:00001d000107 ANSI LIN xxxxxxxxxx7 101 5 8 00001d000001:00001d000108 ANSI LIN xxxxxxxxxx8 101 5 9 00001d000001:00001d000109 ANSI LIN xxxxxxxxxx9 101 5 10 00001d000001:00001d000110 ANSI LIN xxxxxxxxx10 101 5 - In one specific example of configuring, a location server enables automated configuration of location clients, such as switches and routers. Often, network switches have to support complex configurations, and that complexity limits the ability of the switch to be moved around the network. If
system 100 enables a network switch as a location client, it is possible to automate the configuration of the network switch. In this example, a network operator enters a wiring closet and simply plugs in a network switch that only contains its network layer address and the network layer address of the location server. After the network switch powers up, it detects (step 310 (FIG. 3 )) its location, for example as described above, by analyzing an IEEE Spanning Tree BPDU to determine (step 315 (FIG. 3 )) its connection point ID. Once the network switch determines (step 315 (FIG. 3 )) its connection point ID, the network switch initiates (step 320) a conversation withlocation server 134. In this example, the location server references (step 350 (FIG. 3 )) the connection point ID to a location database field which represents the base configuration file of any network switch that may connect to the network at that location. Table 3 is a table containing an example of the type of information that can be included in an expanded location database that includes additional configuration parameters to configure a network switch. In addition to the connection point ID and the location reference, the location database represented by Table 3 also includes a configuration file parameter identifying the configuration file to be used to configure a location client at that corresponding location.TABLE 3 Location Location Connection Point ID ID Type Ref. Configuration file 1 00001d000001:00001d000101 Lat-Long x1° by y1° closet1.cfg 2 00001d000001:00001d000102 Lat-Long x2° by y2° closet2.cfg 3 00001d000001:00001d000103 Lat-Long x3° by y3° closet3.cfg 4 00001d000001:00001d000104 Lat-Long x4° by y4° closet4.cfg 5 00001d000001:00001d000105 Lat-Long x5° by y5° closet1.cfg 6 00001d000001:00001d000106 Lat-Long x6° by y6° tftp:/1.1.1.1/closet15.cfg 7 00001d000001:00001d000107 Lat-Long x7° by y7° closet1.cfg 8 00001d000001:00001d000108 Lat-Long x8° by y8° http:/2.2.1.1/closet99.cfg 9 00001d000001:00001d000109 Lat-Long x9° by y9° closet1.cfg 10 00001d000001:00001d000110 Lat-Long x10° by y10° ftp://3.3.3.3/config10.cfg
3.2 Restrictions Based on Location (FIGS. 4, 5 , and 6) - In addition to provisioning and configuring, the operations of
system 100 can be restricted based on location. These restrictions can involve restrictions on the access and use ofsystem 100. These restrictions also can involve the transmission of data around and throughsystem 100. For an overview example relating to network access, the location information within a network enables authentication based on location. Location information allowssystem 100 to authenticate a user not only based on the credentials provided by the user, but also based on the location of the device used by the user to access the network. Dependent upon the device location,system 100 can allow or restrict access to certain devices, information, applications, signal exchange priorities, and the like. Further, even if a device and/or its user supplies to system 100 a claimed device location,system 100 can employ the techniques described herein to confirm the location independently from the device. This ensures that the device location comes from a trusted source (e.g., assign an acceptable value for the level of trust parameter) and can be used reliably. - For an overview example relating to data restrictions,
system 100 can add one or more parameters to data associated with a network (e.g., a proprietary database) for restricted access as a function of the location of the device seeking the information, or a combination of user and location information. For example,system 100 may be programmed to deny access to corporate business information upon request from a network entry device, or coming through an intermediate device that is located outside of a specified region.System 100 also can employ location information to effect a change in a file dependent upon the location of the device accessing that file. In particular, the file may include a lock-out indicator or a destruction indicator if an attempt is made to open it from outside a specified location. One example is sensitive corporate business information. If an attempt is made to access such information from what is otherwise an authenticated device, that information or file may nevertheless be destroyed if the authenticated device is not at a specified location or region. This feature can be seen as valuable in maintaining the security of files retained on or accessed by a device that is not in the possession of an authorized user. The examples that follow describe these overview examples in more detail. - 3.2.1 Restricting Access to Network (
FIGS. 4 and 5 ) - As described in the overview example, location information allows
system 100 to authenticate and restrict a user based on the location of the device used by the user to access the network. The location information can be added as an authentication attribute to typical authentication systems. Entry into and usage of a network is typically regulated using authentication systems such as Network Operating Systems (NOSs), Remote Authentication Dial-In User Service (RADIUS), described in IETF Request For Comment (RFC) 2138, and IEEE 802.1X standard, which provides for port-based network access control based on a MAC identifier. In the case of NOS and RADIUS, an authentication server (e.g., 142 (FIG. 8 )) provides the mechanism for establishing such authentication. In the case of IEEE 802.1X, the network entry devices 114 may be configured with such authentication capability, as described more fully in that standard. IEEE 802.1Q standard provides another means for controlling access and usage of a network. That standard is directed to the establishment and operation of VLANs. The IEEE 802.1Q standard defines the configuration of network devices to permit packet reception at a configured port entry module. Firewalls (e.g., 140 (FIG. 8 )) also provide a technique for network usage regulation. Firewalls are primarily computer programs designed to analyze packets and, from that analysis, make a determination as to whether packet transmission into or out of the network is permitted. Being location-aware,system 100 is able to combine the association of a device's physical location with any of these network access regulations as an attribute to assess permitted network access. For example, a VLAN policy template distributed to network devices to configure VLANs can be accompanied by a physical location constraint. - In general overview of the authentication process, a user device 104 connects to the
network infrastructure 101, via a connection point 160.System 100 authenticates the device.System 100 receives the location of the device 104 from the device 104 itself and/or frominfrastructure 101.System 100 receives user credentials and authenticates the user. During this authentication,system 100 verifies the location of device 104 employing the techniques described herein. If the user is authenticated and the location is both verified and authenticated for the requested network resources,system 100 proceeds in allowing device 104 to access the requested resources.System 100 can log each of these events for administrative use. - To describe this concept in more detail, the following example involves the use of an authentication server (e.g., 142 (
FIG. 8 )). In this example, the authentication server, utilizing various protocols, such as RADIUS, TACACS+, Diameter, SecureID®, EAP/IEEE 802.1X and/or the like, includes the functionality of a location server. The authentication server/location server also includes a location database. The location database is expanded to support the ability to indicate whether the authentication server should consider location information when a user or network client tries to log in from a certain physical location. - For example, secure military and intelligence environments can require that certain physical locations be protected from unauthorized use of computing systems available in that secure location. Each computing system includes a location client that the computing system employs during the process of authenticating an individual user. The expanded location database may contain, for example, attributes such as “secure area” or “minimum security level” truth tables. When a user tries to authenticate, the authentication/location server employs the location of the user requesting authorization when validating credentials. The authentication/location server derives this information, for example, using a reference to a connection point ID as described above. If the user has a security clearance of a high enough level to authenticate from that location, the authentication process proceeds. If the user fails to meet the security level associated that particular location, then the network can halt the authentication process, sound alarms and/or report the location of the unauthorized user.
- In more detail,
FIG. 4 illustrates anexample process 401 thatsystem 100 employs to determine whether any restrictions to access the network, based on location, are applicable. Specifically, in examplelocation identification process 401 represented byFIG. 4 , a user seeking access tosystem 100 can be first authenticated (step 405) or otherwise filtered bysystem 100.System 100 achieves this portion of the authorization process by requiring the end user at a location client device to supply certain user information including but not limited to, a name and one or more passwords (e.g., necessary user credentials). If the user is permitted access tosystem 100 on that basis (e.g., user name and password),system 100 permits the user to query (step 410)system 100 for access to certain information, applications, and the like. Alternatively or in addition,system 100 receives (step 415) the device location before allowing the requested access. A trusted user device (e.g., 104), a network infrastructure device (e.g., a network entry device 114) and/or a location server can supply the user device location using the techniques as described herein. - With the received location information,
system 100 authenticates (step 420) that the physical location of the client device is in a permitted and authorized location for access to the requested network resources. In one example,system 100 permits requested access from devices having pre-approved location identifying equipment, such as a trusted device that can identify the location of that client device. As described above, this can include a GPS receiver associated with the client device thatsystem 100 has previously evaluated for trustworthiness (e.g., cannot provide false location). This also can include a trusted device withinnetwork infrastructure 101 such as an authenticated router or switch or a hardwired GPS receiver that can provide location information using the techniques described above. The creation of the trusted device also may be a recursive function if the client device is located relative to the trusted device and the network or the network location resolution is built outwardly. - In general,
system 100 performs an ongoing policing function, for example by repeating the process shown inFIG. 4 periodically or when new information becomes available or triggered by external events. - In another example, the
system 100 employs a level of trust parameter to authenticate (step 420) the trustworthiness of the location information. The values for the level of trust parameter can vary, using a sufficiently large scale and range to allow for changes and growth. For example using a sixteen bit word,system 100 can use a a scale from 256 to 3,840, where 256 corresponds to the lowest level of trust and 3,840 corresponds to the highest level of trust. This range, because it does not use all sixteen bits, provides room for growth in the range assystem 100 develops over time. Any levels in between the lowest and highest levels of trust represent a mixed level of trustworthiness andsystem 100 determines whether it will employ the location information with a mixed level dependent on the type of access the user requests (e.g., results of the query (step 410)). A more sensitive application and/or information may require a trust level of 3,072 or greater, whereas a general application and/or information may require a trust level of 1,023 or greater.System 100 may allow a user to access public information regardless of the value of level of trust. In other words, the required level of trust value to authenticate the location can vary depending on the types of resources to which the client requests access. - In one example,
system 100 determines the level of trust of the location information based on the originator of the location information. If the location information originates from an internal routing device withininfrastructure 101, without public access and under control of a network administrator, and the connection point is a jack in the wall, with an attaching cable that cannot be altered without destroying the wall, thesystem 100 can assign the highest level of trust value of 3,840 (i.e., this example employs a scale of 256 to 3,840). In this case the probability that the location information will be incorrect or has been altered is very low or non-existent. If the location information originates from a wireless access point (e.g., 120 b) within thesystem 100 that determines the location of the user device using a technique described above, there is some trust because a wireless access point 120 is within the infrastructure 01 of the network. There is some possibility of signal manipulation, however, sosystem 100 assigns the location information a level of trust a value of 2,256 because the probability of incorrect location information is relatively higher than the jack in the wall example above. If the location information originates from the user device itself using a system that is allegedly tamperproof, or comes with a third party certification,system 100 can trust this slightly, but again is not sure of what can be done to manipulate signals, sosystem 100 assigns this a level of trust value of 1,023. If the location information originates from the device with little or no safe-guards (e.g., using a built-in GPS with no tamper-proof technology),system 100 can assign the location information a level of trust of value of 456 (e.g., trusts all GPS signals slightly) or 256 (e.g., no mechanisms to prevent signal tampering, so assign lowest value). - With reference to
FIG. 4 , oncesystem 100 has authenticated (step 405) the user and authenticated (step 420) the device location information,system 100 considers the access request.System 100 determines (step 425) whether the user has the proper credentials for the level of the requested service. To do this,system 100 compares the user credentials, the location information, and the conditions of access requested (e.g., a request for a certain database of information, a request for a certain application, and the like) with any stored location restrictions. Ifsystem 100 determines (step 425) the user is authenticated for the particular request,system 100 determines (step 430) whether the device used by the user is in a location approved or otherwise permitted to receive the requested information, application, and the like. If both threshold questions (step 425 and step 430) are answered in the affirmative,system 100 permits the user to access, via the client device at the known location, the material requested. If either threshold question (step 425 and step 430) is answered in the negative,system 100 denies (step 440) the user access and can notify the network manager. In addition or as an alternative to denying access,system 100 also can entertain, honeypot, and/or otherwise disable and delay the requesting client to provide time for an administrator to take additional action, such as notifying authorities. In another example,system 100 bases access to the requested material solely on device location, and the optional steps of authenticating (step 405 and step 425) based on user identification information are not a pre-condition for access. As described above,system 100 can continually police location authentication by loopingsteps arrow 440. -
FIG. 5 represents anotherexample authentication process 500. In the illustratedprocess 500,system 100 obtains (step 505) the location information for an client device. In this case,system 100 employs only the location of the device in determining the appropriate level of service. In another example,system 100 can also employ the user credentials (e.g., user name and password), in addition to the location, to determine the appropriate level of service.System 100 determines (step 510) whether the obtained location is verified. Ifsystem 100 determines (step 510) that the location is not verified,system 100 denies (step 515) access or restricts (step 515) access according to predefined policies (e.g., deny any access or restrict access to only those devices, applications and data available to the general public regardless of location). Ifsystem 100 determines (step 510) that the location is verified,system 100 determines (step 520) whether the location is authenticated. Ifsystem 100 determines (step 520) that the location is not authenticated,system 100 determines (step 525) whether to accept the asserted location. Ifsystem 100 determines (step 525) to not accept the asserted location,system 100 denies/restricts (step 515) access according to predefined policies. Ifsystem 100 determines (step 525) to accept the asserted location,system 100 allows (step 530) access at selectable service levels, as described below, according to predefined policies. - If
system 100 determines (step 520) that the location is authenticated,system 100 determines (step 535) whether the user location is authenticated at the level required. This can include, for example, having a minimum level of trust for the requested level of access. Ifsystem 100 determines (step 535) that the user location is not authenticated at the level required,system 100 allows (step 530) access at selectable service levels, as described below, according to predefined policies. Ifsystem 100 determines (step 535) that the user location is authenticated at the level required,system 100 allows (step 540) access at the authenticated level. - As described in conjunction with
process 500,system 100 allows a user access tosystem 100 at selectable service levels, based on location information (e.g., step 530). Examples of selectable service levels include, but are not limited to: access denied; threshold access permitted regardless of device location; trusted user and device location is verified but not authenticated, some restricted services permitted; general location verified (e.g., in a public area, airport, country, city, telephone area code or exchange) and some limited access permitted; verified ISP and user verified; verified ISP and user not verified, some limited access permitted; previously authenticated location, re-authentication required based on time intervals; authenticated location and user, permit all predefined permissions; and re-authentication required. Some of these levels can be combined to include additional service levels. For example, re-authentication may be required at any time for any reason including, but not limited to, topology changes, timeouts, untrusted network devices, location database changes, disconnected cables or local or remote triggers from intrusion detection systems and firewall systems.System 100 can enforce such re-authentication policies, for example by using the edge policing described inFIG. 3 . These service levels may correspond to the levels of trust described above (e.g., level of service dependent on a minimum value of the level of trust of the location information). - Use of the above techniques enables
system 100 to restrict access to data, applications, specific networked devices, data and network service, QOS (Quality of Service) levels, network tools, functionality, rules, and the like, based on the user and/or the location of the device associated with the user seeking access. Further to the techniques above,system 100 can employ the location information to effect a modification of the access requirements. For example, when a device seeks network access from a location deemed not to be inherently secure (e.g., such as a public facility like an airport),system 100 can prompt a user to initiate an improved connection, such as a virtual private network (VPN), or can inform the user that supplemental restrictions apply while in the insecure area. More generally, this can be seen as an expansion of policy-based access in that the access rules for an individual user may be adapted as a function of the client device location and/or the level of trust associated with the location information. - Further to the techniques described above,
system 100 also can provide restricted access to the network based on a particular port connected to the connection point to which the location client is connected. In one example,system 100 employs the techniques above to determine the location of the connection point associated with that particular port, rather than assume a location supplied by the location client is correct. For that particular port for which location has been established and can be trusted,system 100 encodes transmitted data such that the port associated with the trusted location and only that port will accept the encoded data for transmission. If the user disassociates from that particular port, whether intentionally or unintentionally, he/she must re-authenticate. - In this example,
system 100 performs the authentication and any re-authentication using an encryption key process. Specifically, an end user, thatsystem 100 has authenticated by user and by location, is provided with an encryption key that is designed to work only on the port through which the key was supplied, and no other. That is, the key cannot be obtained and then used through a different port, which would be the case if the device used by the user were to move locations (e.g., change connection points). It is to be noted that the key may be tumbled, rotated, and the like. In one example, the network entry device has no knowledge of the specific key, but instead uses the port number/logical port number and one or more of a MAC address, an IP address, its own generated encryption key, and the like, to permit transmission.System 100 also can modify a data packet so that its receiver can only determine whether the transmission came from the right user (e.g., based on the use of the right key) and was modified by an authenticated device (e.g., the location/authentication server) for that particular access port (e.g., 113 (FIG. 1 )) of the network entry device (e.g., 114 a (FIG. 1 )). In another example, there is a three way keying. The client device, the port from the network entry device and the server providing the data each have their own associated keys. In this way, the server can verify that the data coming from the client is indeed coming through the port with the assigned key, for example by verifying signatures on the data from both the client and the authenticated port. In summary, the key is only good for that port which has been specifically established to authenticate that user at the authenticated location. In that way,system 100 can prevent a user from obtaining access, using a false allowable location, by denial of port access when the end user's location has changed, even if the original encryption key for that allowable location has been acquired. - 4.2.1 Restricting Location of Data (
FIG. 6 ) - In addition to access control,
system 100 can use location information to enforce restrictions regarding the transmission of data. As described in the overview example, location information allowssystem 100 to deny access to certain sensitive information upon request from a location client outside of a specified region, or to prohibit data from being transmitted through an intermediate device that is located outside of a specified region.FIG. 6 illustrates anexample process 601 thatsystem 100 employs to effect these data transmission restrictions. Specifically, in the exampleinformation tagging process 601 represented byFIG. 6 ,system 100 receives (step 605) a request from an end user for access to information (e.g., file, document, and/or the like, generally, data). This assumes that the end user has been adequately authenticated or otherwise permitted access to the network, as described above.System 100 then determines (step 610) whether the requested data is location sensitive. That is, whether the data should not be moved beyond certain defined boundaries (e.g., a present device, a room, a building, a campus, a city, a country and the like). Ifsystem 100 determines (step 610) that the data is not location sensitive,system 100 permits (step 615) access to that data that is not restricted by location. - If
system 100 determines (step 610) that the data is location sensitive,system 100 tags (step 620) the data. For example, the application generating the data and/or the server generating a data packet to transport the data over the network can add this tag while generating the data and/or packet. In one example, the tag comprises a file header that identifies location restrictions. The file header also can include a key. In some examples, an end user can request to add a tag to sensitive data such that it cannot be transmitted outside of a defined location (e.g., home, corner office, the courtroom, a hospital, a healthcare facility and the like). The tag may be configured either to deny opening (step 620 a) of the transmitted data at an unauthorized location, or to destroy (step 620 b) the data when it is determined that the data is in an unauthorized location. The file header may itself be coded or encrypted. Additionally the data/file may be so encrypted such that the deletion of this special file header will either deny opening of the transmitted data, or force the destruction of the data, regardless of the location. - A device within
system 100 and/or the data itself determines (step 625) whether the data is outside the permitted location(s). If the data is not outside the permitted location(s), thesystem 100 permits (step 615) access to the data. If the data is outside the permitted location(s),system 100 denies (step 630) access to and/or destroys (step 630) the data. If the data is going to be routed in the next hop to a location that is outside the permitted location(s), thesystem 100 prohibits the data from being transmitted to that device outside of the permitted location(s). For example,system 100 can employ edge policing, as described withFIG. 3 , where devices ofinfrastructure 101 police and enforce access by controlling whether or not the data is forwarded to a location client requesting the data. The data itself, or an application trying to access the data, can also police and enforce these restrictions by including executables that obtain the location, with an acceptable level of trust, of the device in which it executes and prohibit access if such location is a prohibited location. - The
system 100 can be optionally configured to provide additional security override controls to the end user to prevent destruction of the tagged data or denial of access to the tagged data if the user is located outside of the permitted area of access. In this case,system 100 polices access to the data and not necessarily wheresystem 100 forwards the data. In this example, even if the data is outside the permitted location(s), thesystem 100 determines (step 635) whether the tag can be overridden. If the tag can be overridden, thesystem 100 permits (step 615) access to the data. In this case, the access (step 615) is limited access. For example, the user may be allowed to load the data into a user device for transport, but the user cannot read or edit the data until the user device is located in a permitted location. - 4.3 Providing Other Services (
FIG. 7 ) - With a location-aware infrastructure,
system 100 can employ trusted location information to provide other services in addition to those described above. For example,system 100 can use the location information in emergency situations, where a device may be an alarm or sensor.System 100 determines the location of the alarm device and transmits the location information to a party responding to the alarm.System 100 can also use location information to recover a stolen user device 104. As the stolen user device 104accesses system 100,system 100 determines the location of the stolen device and transmits the location information to a party seeking to locate the device.System 100 can track mobile user devices (e.g., 104 b) and thus can also track anything associated with that user device (e.g., the user, a file, a physical object, and the like).System 100, through the use of location information, can provide these and other services and applications. The examples that follow illustrate howsystem 100 can employ location information to provide these and other services and applications. - In one example,
FIG. 7 illustrates aprocess 700 for establishing a security service in a network environment based on location information. Inprocess 700, the client devices may be physical intrusion detection devices, smoke detectors, fire alarms, EMT devices, wireless panic buttons, and the like. These client devices are designed to signal an emergency event. Alternatively, the device may be any sort of network-connected device that is configured to transmit an alarm upon failure or imminent failure, or to transmit an alarm if a device connected to it fails. If the device includes a location module 185,location server 134 can provide and store that device's location information in that device itself. - In one example, an event triggers (step 705) a smoke detector on the 4th floor of the 5th building on the left side of the street.
System 100, to which the triggered device is connected, either determines the device's location using the techniques described herein or queries (step 710) the triggered device's specific location information.System 100 directs the query to the device itself, or tolocation server 134.System 100 receives (step 715) the location information, either as an absolute or a relative location. As described above, the location information may or may not be trustworthy.System 100 can verify the location information to make it trustworthy or increase the level of trust required for the particularsecurity service system 100 is providing.System 100 relays (step 720) that detailed location information to the appropriate authorities, potentially leading to greater response efficiencies. A location client having a network association can be made more effective by linking the device's location information with that device's operation. - Another example of a
security service system 100 provides is to protect sensitive devices from theft. For example, if a laptop computer is stolen and the thief seeks to accesssystem 100,system 100 evaluates the location information, whether obtained directly from that client or from thelocation server 134 when the end user accesses the network. In the event that network entry is sought, the location of the requesting client is acquired. Assumingsystem 100 can determine that that particular location client has been stolen,system 100 supplies the location information to a suitable authority. To provide authorities enough time to get to the identified location,system 100 also can entertain, honeypot, and/or otherwise disable and delay the requesting location client. The location-aware system 100 thus can be used as an effective means to exchange accurate location information in relation to a security violation and, potentially, to neutralize effects associated with that violation. - Yet further, the location-based
system 100 and the techniques described herein may be employed to regulate and/or accurately monitor the movement of individuals, equipment, packages, and the like, as they travel near and through network infrastructure 01. An electronic device (e.g., user device) that communicates withsystem 100 is applied to a pass, a label, an asset tag, and the like. That device includes means to enable tracking of its location using techniques, for example, the radio-based techniques described above. For example, all visitors to a secure facility are supplied with a visitor pass. That visitor pass includes a transceiver that is capable of communication with wireless access points (e.g., 120 b (FIG. 1 )) ofnetwork infrastructure 101 positioned throughout the facility. These wireless access points can be configured such that as the tag/pass/visitor moves throughout the facility, network infrastructure 01 determines the visitor's location using the techniques described above. In addition, security guards can know whether any visitors remain in the facility at a planned closing time. This eliminates the need for the facility to maintain a separate tracking system with sensors. Instead of the separate tracking system, the samedata network infrastructure 101 employed for network access also can be employed for tracking, by associating a location with each of the devices that communicate withnetwork infrastructure 101. - These techniques enhance network security, enhance device security, likely improve emergency responsiveness, and may be employed to establish network-based organizational security. These and many other advantages are provided through the association of relevant network device and networked device location information with security, protection, and response efforts.
System 100 can also provide other services based on location not described above. For example,system 100 can provide enhanced network topology discovery and mapping, with device map representations specific to their physical location. For example,system 100 can employ location information to prepare accurate maps that associate devices with their physical locations.System 100 also can provide device inventories by location, without the need of manually verifying each device individually. As described above, the location database can be expanded to include device ID information along with the corresponding location information. - Further,
system 100 can employ location information to check that network rules are followed (e.g., if wiring designs are inaccurate and must be supplemented or changed). The location information can be of value to the LAN manager and, for example, to an Internet Service Provider (ISP) or a cable operator interested in knowing the locations of cable modems and phone line terminations. -
System 100 also can provide information to a user that is relevant based on that user's current location. For example, a traveling end user may dial into the network, have the connecting device's location information acquired or supplied, and then be directed to hotels, restaurants, and the like, within a defined radius of the device's location and meeting any number of selectable criteria. - 5.0 Some Additional Examples (
FIG. 8 ) - Referring to
FIG. 8 ,system 100′ provides another example of a location-aware network and is described as an enterprise network that serves as a data communications network for a business organization or other type of enterprise. The enterprise operates the network according to various policies, which may include location-dependent aspects. For example, access-control policies may depend on the locations of devices accessing services on the network. In various configurations,system 100′ may include or make use of one or more LANs, MANs, WANs, PANs and/or Ethernet to the first mile (e.g., IEEE 802.3ah). In other examples of such a network, the physical and logical arrangement of the devices can differ from that shown inFIGS. 1 and 8 . -
System 100′ includes various types of devices. Some devices arenetwork entry devices 114 c-j, generally 114, which provide access to aninfrastructure 101′ ofsystem 100′ touser devices 104 c-l, generally 104, or to external networks such asInternet 148 ortelephone network 132. The portion ofsystem 100′ excluding user devices 104 and external networks is referred to asnetwork infrastructure 101′. Thisinfrastructure 101′ includes devices for switching and routing data within thesystem 100′, including one or morecentral switching devices 136′ and computers that provide services in support of access to and routing of data in thesystem 100′, including anauthentication server 142, anapplication server 134′, and other servers such as a domain name server (not shown). In addition,system 100′ includes devices such as a printer 122 and afax machine 123 which have some characteristics of both user devices and of network infrastructure devices. - Network entry devices 114 provide access to
network infrastructure 101′ over various types of transmission media, including cable-based or wireless. The cable-based transmission medium can include, for example, twisted pair wires used for a 100-Base-T Ethernet link. A cable-based transmission medium can also be a shared cable-based transmission medium that can connect more than two devices. For example, a coaxial cable used for 10-Base-2 Ethernet, telephone cables used for high-frequency (e.g., HomePNA) communication between multiple devices, and power lines used for data communication (e.g., HomePlug) between devices provide such shared cable-based transmission media. - Entry devices 114 together include a number of entry port modules (e.g., 113′ and 118), each associated with a different medium (e.g., a cable and/or a portion of a radio spectrum). For instance, in
system 100′,entry port module 113′ ofnetwork entry device 114 f is connected touser device 104 c by a dedicated cable-basedtransmission medium 112′. -
Entry port module 118 ofnetwork entry device 114 g is connected touser devices 104 d-f by a sharedwireless transmission medium 119′.Entry port module 146 of network entry device 114 d is connected to user device 104 g byInternet 148 and sharedtransmission medium 152. Further,entry port modules network entry device 114 e may be connected touser device 104 h bytelephone network 132 and by sharedtransmission media 154.Entry port modules network entry device 114 e may also be connected to user device 104 m using a cellular telephone (or PCS) tower 175, which is connected via a base station 178 to thetelephone network 132 and the sharedtransmission media 154. Any of network entry devices 114 may be coupled by different port modules to both shared and dedicated transmission media as well as cable-based and wireless transmission media. - Network entry devices 114 and end user devices 104 can come in a wide array of configurations. For example, user devices 104 can include individual computers, printers, servers, cellular phones, laptops, handheld electronic devices, telephones, Internet Protocol (IP)-configured telephones, switch devices, and the like. Network entry devices 114 can include, for example, switches, routers, hubs, bridges, repeaters, wireless access points, data communications equipment, server computers, modems, multiplexers, Private Branch Exchanges (PBXs), virtually any devices used to interconnect data equipment or end devices, and the like. The discreet boundaries of
infrastructure 101′ are for illustration only. For example,system 100′ may include a server outside of the illustrated boundary while remaining logically part ofinfrastructure 101′. In another example, there may be a portion ofnetwork infrastructure 101′ connected tosystem 100′ located in a remote network, such asInternet 148. - In any particular physical arrangement of
system 100′, each device (e.g., 104, 114) has a connection point (e.g., 160 c, 160 d, 160 e, 160 f, and 160 g, generally 160). A connection point 160 is the place where an associated device connects tosystem 100′, and thus corresponds to the location of that device. For example, for devices communicating via a cable (e.g., 104 c, 104 g, 104 h, and 114 g), their connection points (e.g., 160 o, 160 l and 160 k, and 160 n, respectively) represent the terminus of the cable (e.g., a wall jack) where the respective devices physically attach to make a connection to the network. For example, connection point 160 o represents the terminus ofcable 112′. Forwireless device 104 f, the transmission medium is air, so therespective connection point 160 m represents the location of the receiver antenna receiving signals from the wireless device. For any physical arrangement ofsystem 100′, each connection point 160 is associated with a connection port innetwork infrastructure 101′ that provides connectivity to the rest ofsystem 100′. For example,user device 104 c, which is attached to connection point 160 o (at the end ofmedium 112′), is associated withconnection port 113′. Note that should the physical arrangement ofsystem 100′ change, for example, ifmedium 112′ were disconnected fromport 113′ and reconnected to a different port in the same device or in a different device, the association of a connection point and a connection port may change. As described above, maintaining an association of connection points and connection ports, particularly in generating connection point IDs, provides a way for determining locations of devices in thesystem 100′. - 5.1 Distributed Location Database
- In some of the techniques/mechanisms described above,
system 100 employs acentralized location server 134 that contained location server functionality and the location database. As an alternative to the centralized system, the location-aware portion ofsystem 100 can be implemented as a distributed system. In examples of a distributed system, the location server functionality and the location database are distributed among the devices of the network. In example distributed systems, location module 185 exists in any one, a portion, or all of the exemplar devices of a network, including for example the entry devices (e.g., 114), a server (e.g., 142), a firewall (e.g., 140), and the like. As illustrated inFIGS. 1 and 8 , some devices comprise a location module (e.g., 185 a-o, generally 185), whether in hardware, firmware, or software, that can be configured to include different functionality and pieces of information, including location information. As described below, for a distributed system example, devices both inside andoutside network infrastructure 101 can optionally maintain location dependent information that affects their operation. - 5.1.1 Distributed Within the Network
-
FIGS. 1 and 8 illustrate location modules 185 in a portion of the devices for example only. As described above, the information representing the location of a particular network device, or one or more devices attached to a particular network device, may be preloaded into location module 185 as a database. The location database at each device can be the entire location database ofsystem 100, or a portion of the location database. In particular, the portion of the database included in the location module 185 of the device can be a portion with those locations applicable to that particular device. For example, all of the connection points associated with the ports of a particular network entry device. Alternatively, location module 185 may include an updateable table that changes with additions or deletions tosystem 100 and/or movement of devices associated withsystem 100. Location module 185 can include location information and can be configured to measure, calculate, infer, search, and/or otherwise acquire information to provide one or more of the detailed mechanisms/techniques described herein. Location module 185 also can be configured to be an access control module that enables regulation (e.g., policing) of access to network-based data, applications, QoS, ToS, bandwidth, and the like, based on device location information. For example as illustrated inFIG. 4 , for the distributed system, location modules 185 are configured to include device location as a requirement to permit access to network-based information, applications, rate service, rate type, and the like. With such a distributed system, each network entry device (e.g., 114) becomes a quasi-authentication server. As illustrated inFIG. 6 , location modules 185 are configured to include means for tagging location-sensitive information/data and acting on that tag accordingly. Each location module 185 also can enable identification of the location of a communicating device for the purpose of providing security, safety, or other services described above. - For the distributed example, location server functionality can be part of any network device, management station, or server/authentication server. The location server functionality may be co-located within a switch or network device (e.g., 114) through which a user device communicates. In a distributed system, devices can include functionality in their respective location modules 185 to be both a location client and a location server. In remote offices, a router that connects the remote office to the home office can comprise the location server functionality, as it may need to provide location information for E911 applications, for example. In other applications, such as an enterprise campus networks, the location server functionality may be part of an enhanced IP address management system such as a Dynamic Host Configuration Protocol (DHCP) server as well as a dedicated location provisioning system.
- The following is a list of a few possible devices (but not limited to only those devices) that can contain the location server functionality: network switches, data switches, routers, firewalls, gateways, computing devices such as network file server or dedicated location servers, management stations, network connected voice over IP/voice over data systems such as hybrid PBXs and VoIP call managers, network layer address configuration/system configuration servers such as enhanced DHCP servers, enhanced Bootstrap Protocol (bootp) servers, IPv6 address auto-discovery enabled routers, and network based authentication servers providing services such as radius, extensible authentication protocol/IEEE 802.1X or others.
- In one example, to provide the distributed location databases with location information,
system 100 employs a Simple Network Management Protocol (SNMP). A network administrator provisions the location information of the terminus of a network cable in the SNMP ifDescr variable (e.g., the ifDescr is a read only attribute, but many systems allow a network operator to “name” a port, which then will be displayed in this field). The location server functionality of a device reads the terminus information via the SNMP. - As described above, the location client attempts to learn its geographic location and/or identifies itself to another device with a need to know the client's location. An advanced location client can also receive its operational configuration from a location aware network (e.g., from a location server configured to additionally provide configuration information). The location client communicates with any network element and discovers its connection point ID through one of many possible methods described herein. Once the location client knows its connection point ID, it can contact a location server to discover its actual location, or to register itself with the location server, which can act as a proxy for other communication entities seeking to discover the location of the location client. It is also possible for a location server to be a communication system that may modify the location client's communication traffic with the device's location information.
- The following is a list of a few possible devices (but not limited to) that can contain a location client: network switches, routers, firewalls, gateways, computing devices such as a network file server or end user computing devices, personal digital assistants, smart appliances (toaster, refrigerator or coffee pot with network connectivity), network connected voice over IP/voice over data systems such as hybrid PBXs and VoIP call managers or voice over IP/data handsets.
- 5.1.2 Distributed Outside of the Network
- In addition to their being distributed among the devices of
system 100,system 100 can employ location information from a trusted database that is external to the network and/or a trusted database maintained by a third-party. As described above,system 100 can assign a level of trust for all of the location information obtained from a database external tosystem 100. For example, in the telephone network example, where the unique connection point ID can be a telephone number, the location server functionality, either inlocation server 134 or any of the distributed functionality in the location modules 185, can reference a white-pages type database to retrieve an address for the telephone number. If the address is not a location format recognized by a location-aware application, the location server functionality can reference another third-party database to convert the address to latitude and longitude coordinates, for example. Further granularity may be obtained. For example, for a home business, an address may have two phone numbers associated with it, a business phone number and a residential phone number. The location of the connection point identified with the business phone number is in the room established as the home office. This may be located on one floor of the house, providing altitude coordinates also. The location of the connection point identified with the residential phone number is in the room containing the family personal computer. This may be located on another floor of the house. Similarly, the location server functionality can obtain an address, a room, and/or geographical coordinates where the connection point is a cable endpoint connected to a cable modem and the IP address is associated with an address of the subscriber.System 100 can use any available resources to update the location information of particular connection points, assigning the appropriate level of trust based on the trustworthiness of that third party source. - 5.2 Use of a Location Advertising System in a Distributed Network
- In one distributed example,
system 100 employs a location advertising system to communicate information among the devices. A location advertising system comprises a networking device that provisions and/or advertises device location information and/or configurations to a location client device over the network, typically using a layer 2 or layer 3 protocol (e.g., a neighbor discovery protocol). The location advertising system also comprises devices to which location client devices may connect via the network. An example of a location advertising system device can include a location advertising switch, which is a device, such as a data switch operating as a layer 2 or layer 3 LAN switch. Another example of a location advertising system device can include a location advertising router, referred to sometimes as an automated configuration server, which comprises a network router. This device can also comprise a branch office router that can provide a configuration to a LAN switch and/or a wireless access point in a remote enterprise office. Other devices in the location advertising system can include a wireless LAN access point, a virtual private network system, a tunnel server, a remote client, a gateway and/or the like. A device acting as a location advertising system may distribute location information based on various coordinate systems or textual representations of a physical location. A device in the location advertising system, when it is a device that has location clients physically connected to it via physical cables, contains a database of connection points that correspond to a physical network access port and the corresponding geographic location information of the terminus of the network cable connected to that port, similarly as described above. Although presented in the context of a distributed system, the location advertising system can also be implemented in a centralized system using a centralized location server as described above. - When
system 100 employs a LAN Switch in its location advertising system,system 100 not only provides location and configuration information to a location client device, but it also can automatically map network policies to the port where the location client device is connected. This policy may be provisioned on the location advertising switch as soon as the location client is detected or policy provisioning may be enabled only after the location client is properly configured and verified. This feature is referred to as self-enabled policy. - When a location advertising system comprises a wireless LAN access point, the network maps location and configuration information to a device specific identification, IEEE MAC address as an example, and the IEEE 802.11 association ID present during the operation of the wireless network. The network maps the location coordinates to the association ID. As wireless networks afford client devices total mobility, the system employs techniques, such as the techniques described above for example, to triangulate the coordinates of the location client at any instance. The location database can be dynamic in nature as the client's coordinates can potentially change very frequently.
- 5.2.1 Specific Examples Using a Location Advertising System
- One example of automated network management employing the location advertising system is the configuration of Voice over IP handsets with a neighbor discovery protocol in a data network. Voice over IP handsets typically are designed to communicate with Ethernet switches and can require complex configurations. Networks with the location advertising system can integrate neighbor discovery protocols with Voice over IP handsets to provide configuration information to the handset, discover inventory information to be stored on the connection point switch, and automatically configure the ports' parameters on the connection point switch/access platform.
- The automated voice handset configuration system in this example can provide the voice handset with several parameters. For example, the system can provide VLAN membership and classification rules for voice and/or fax payload and control traffic. The system can also provide VLAN membership and classification rules for non-voice payload and control traffic. The system can also provide the IEEE 802.1Q prioritization packet marking information of voice payload and control traffic. The system can also provide the IEEE 802.1Q prioritization packet marking of non-voice payload and control traffic. The system can also provide the IP type of service field markings for the voice payload traffic. The system can also provide the IP type of service field marking for fax payload traffic. The system can also provide the IP type of service field marking for voice/fax control traffic. The system can also provide the Internet address for the voice entity contained in the VoIP phone. The system can also provide the ANSI LIN (Location Identification Number). The system can also provide the geographic location of the handset with geodesic information or any other geographical coordinate system including elevation or relative location information.
- For illustration of this specific example, let
user device 104 c (FIG. 8 ) represent a VoIP handset andnetwork entity device 114 f represents a LAN switch. The LAN switch 114 f includes location advertising system functionality, for example, as part oflocation module 185 n. The LAN switch 114 f also includes an expanded database in location module 185 that includes inventory information, geographic information and configuration information. In operation, the Voice overIP handset 104 c boots and starts sending out neighbor discover protocol packets. These packets trigger theLAN switch 114 f to which theVoIP handset 104 c connects to start sending neighbor discovery protocol packets. The LAN switch 114 f responds back to thevoice handset 104 c with the following configuration information obtained from its expanded database: IEEE 802.1Q priority marking configuration, IEEE 802.1Q VLAN membership configuration rules, Internet protocol type of service/differentiated services marking rules, the IP address of the voice call managers/IP PBX/IP voice switch which thevoice handset 104 c needs for normal operation, and the ANSI LIN. TheLAN Switch 114 f enables policy management configurations on the port where the switch connects (e.g., self enabled policy). Thevoice handset 104 c continues to utilize the neighbor discovery protocol to continue to advertise its device specific information. This device specific information can include, for example, model number, device type, IP address, device serial number, microcode version utilized by the handset, and the like. The LAN switch 114 f decodes this device specific information from the neighbor discovery protocol packets sent by thevoice handset 104 c and records the advertised information to a local or remote network management database. Thesystem 100′ uses this information to support inventory management and device location applications. - Another specific example of automated network management employing the location advertising system involves the use of network LAN switches in a campus or enterprise network as a vehicle to configure wiring closet switches or wireless access points. In many enterprise networks, the IT organization spends a great deal of time and resources configuring access switches or wireless LAN access points that act as the primary network entry device for network users. These network entry devices normally are provisioned with simple configurations, but occasionally a minor misconfiguration can cause many problems in the operation of a data network. A network with the location advertising system frees network administrators from worrying about the validity of network devices as backbone network switches provision network access switches and routers with the appropriate configuration based on where they connect to the network.
- For illustration of this specific example, let
network entry device 114 f (FIG. 8 ) represent a wiring closet or a user access switch acting as a configuration client. In this environment, theuser switch 114 f is configured to participate as a location client (e.g., includes location client functionality inlocation module 185 n). Thelocation client 114 f is connected tonetwork infrastructure 101′ via connections to networkentry device 114 c,network entry device 114 g, andcentral switching device 136′. Any of those other devices (i.e.,network entry device 114 c,network entry device 114 g andcentral switching device 136′) can act as a location advertising system switch and broadcast location, configuration, and other information to thenetwork entry device 114 f, in this example, the location client. - To determine its physical location,
device 114 f receives location information from each of its neighboring devices, 114 c, 114 g, and 136′.Device 114 c determines that since neighboringdevice 114 f is connected to connection point 160 u,device 114 c is located at location X1, Y1 and transmits the location information todevice 114 f. Similarly,device 114 g determines that since neighboringdevice 114 f is connected to connection point 160 v,device 114 c is located at location X2, Y2 anddevice 136′ determines that since neighboringdevice 114 f is connected to connection point 160 w,device 114 c is located at location X3, Y3.Device 114 c receives the coordinates from each of its neighboring and compares them with each other to determine, with a statistical level of confidence what its actual physical location is. This level of confidence can be translated into a level of trust to associate with the calculated physical location based on the received data. For example, if all three neighboring devices provide the same coordinates, thensystem 100′ can associate the highest value for the level of trust with that physical location. - To determine configuration, any combination of the other devices (i.e.,
network entry device 114 c,network entry device 114 g, andcentral switching device 136′) advertises configuration parameters tolocation client 114 f. The configuration parameters can include, for example, the following attributes: IP address of the user access switch, IP subnet mask of the user access switch, default IP route of the user access switch, SNMP trap destination IP address, SNMP read only community string, SNMP read-write community string, default VLAN ID on user ports, default IEEE priority mark for user access traffic, IEEE 802.1 D spanning tree enabled or disabled, IEEE 802.1W rapid spanning tree enable or disable, enable IEEE 802.1X authentication on user ports, enable IEEE 802.1Q VLAN tagging on ports to data center/configuration provisioning switch, geographic coordinates of the terminus of the data cable connected to this port, and the like. Table 4 illustrates an example of some entries that can be included in an expanded location database in this location advertising system example. In this example, the first five columns from the left (i.e., entry port to geographic location, inclusive) represent information provisioned on the location client. The last two columns from the left (i.e., client switch IP address and serial number) represent information obtained/learned from the location client.TABLE 4 Default Enable Tagging Geographic VLAN ID on the Port Location of Client Entry on User Default where location Cable Switch IP Serial Port Ports Priority data is Received Terminus Address Number 1 1024 0 TRUE Lat X1, Long 1.1.2.1 xxxxxx1 Y1, Alt Z1 2 1024 0 TRUE Lat X2, Long 1.1.2.2 xxxxxx2 Y2, Alt Z2 3 1025 0 TRUE Lat X3, Long 1.1.3.1 xxxxxx3 Y3, Alt Z3 4 1026 0 TRUE Lat X1 , Long 1.1.4.1 xxxxxx4 Y4, Alt Z4
It is also possible for the location advertising system in the provisioning switch to provide a temporary Internet address and/or the unified resource locator (URL) to a network attached location database where the location client can retrieve a more advanced configuration file. For example, see entries 6, 8, and 10 of Table 3 above. The configuration file can be retrieved via standard mechanisms such as trivial file transfer protocol or Internet file transfer protocol. - Another specific example of automated network management employing the location advertising system is the provisioning of a basic switch configuration for local and wide area routers in a branch office. In this example, the network employs a branch office router and a regional office as part of its location advertising system. In one example of the operation described below, the user access switch is a branch office router and the data center switch is a regional office router. In another example of the operation described below, the user access switch is a network entry device in the branch office and the data center switch is a branch office router.
- In operation, a user access LAN switch boots and starts sending out neighbor discover protocol packets. These packets will trigger the data center LAN switch/location advertising switch to which the location client connects to start sending neighbor discovery protocol packets. The data center switch/location advertising switch advertises the configuration associated with the port to which the location client/user access switch connects. This enables policy management configurations on the port to which the switch connects (e.g., self enabled policy). The user access switch continues to transmit neighbor discovery protocol packets to update the data center switch with inventory information, which can be accessed by a network management system.
- 5.3 Format of Location
- The format of location information can vary in different versions of the system. The examples above illustrate some of the formats for location information. The following formats are included as additional examples. The location information may be established as grid or map coordinates on a defined map coordinate system. For example, the location information can be considered absolute (e.g., latitude x by longitude y, GPS location, Loran, Loran C, military grid), regional (e.g., Massachusetts, building 1, the third floor), relative (e.g., x feet from door y on floor z, office five on floor 3, on a 30-degree radial from point A), and/or aircraft systems, such as Very High Frequency (VHF) Omnidirectional Range (VOR) or Emergency Location System (ELS). It is to be noted that GPS locating would include satellite and ground-based stations. The location information may be three dimensional, including elevation above sea level or above some defined position. The location information can include a fourth dimension, accuracy indicator, as required by the federal communications commission for emergency E911 interoperability. The location information also can include a location identification number as required by the federal communications commission for emergency E911 interoperability. The location information can be typed as numerical, string and the like.
- 5.4 Communicating Location Information (
FIGS. 1 and 8 ) - To transmit location and other information among devices, the devices can communicate with each other using a variety of protocols, which can be based on the specific network solution considered. The examples above illustrate some of the protocols used to exchange information. The following protocols are included as additional examples. The devices can employ the Internet Protocol (either version 4 or 6). A high layer protocol can be used based on how
system 100 distributes the location information. For example, ifsystem 100 stores the location information as tables or files,system 100 can employ a high layer protocol such as Light Weight Directory Access Protocol (LDAP) to access and transmit location information between devices. Ifsystem 100 stores the location information as databases,system 100 can employ a high layer protocol such as, Structured Query Language (SQL) or Open Database Connectivity (ODBC) to interact with devices over the Internet Protocol. - The devices also can use a Layer 2 protocol, or a protocol that does not rely on having an IP address to communicate. This enables the devices to define the network layer address, and enables two devices to communicate on networks not operating with the Internet Protocol. The devices can also employ Extensible Authentication Protocol (EAP) or IEEE 802.1X to communicate with each other. The devices can also communicate using proprietary protocols that ride over IP (or other Layer 3 protocols) or MAC layer protocols.
- For illustration, an example in the specific examples of locating devices section above employs IEEE Bridge Spanning Tree Protocol. That example can be illustrated using other protocols also. For example, in another example,
system 100 employs a proprietary network neighbor discovery protocol, Cabletron Discovery Protocol (CDP) by Enterasys Networks, Inc. of Rochester, N.H. In a CDP example, network devices utilize this protocol to provide neighbor discovery. A CDP discovery packet is sent (step 305 (FIG. 3 )) at defined intervals out of all ports with such discovery enabled. The location client receives (step 310 (FIG. 3 )) the discovery packets and decodes the device ID field. In a CDP discovery packet in particular, the device ID field is based on the primary switch MAC address with the SNMP ifindex of the port from which the packet was sent. Using that decoded information, the location client determines (step 315 (FIG. 3 )) that the connection point ID={Primary Switch MAC}+{CDP Sourcing Port's ifindex}. - The
system 100 can employ a combination of protocols to further automate the techniques above. One example employing a combination of protocols is an automated technique that populates the location database, whether centralized or distributed, with connection point IDs. Both the CDP and the IEEE Spanning Tree Protocol have IETF SNMP Management Information Bases (MIB) associated with them. The location server, when enabled with a SNMP client, can generate a list of connection point IDs in the network environment. - In environments where IEEE Spanning Tree Protocol is the mechanism used to discover a location client's connection point ID, the network can use the IETF dot1dBridge MIB. The network uses the dot1dBaseBridgeAddress MIB object to define the unique switch identification. The network can derive the MAC address of the physical port by polling the dot1dBasePortifIndex MIB object. This MIB object corresponds to the ifindex pointer in the IETF SNMP MIB 2 Interface MIB. By looking up the ifPhysAddress MIB object by knowing the ifindex, the network management device is able to populate the Connection ID list (e.g., IEEE 802.1 D Connection ID=Switch Base MAC Address+Port MAC Address).
- When utilizing CDP as the protocol to detect a Connection ID, the network can generate the connection list by polling certain SNMP variables. The network uses the dot1dBaseBridgeAddress MIB object to define the unique switch id. The network derives the MAC address of the physical port by polling the dot1dBasePortifIndex MIB object. This MIB object corresponds to the ifIndex pointer in the IETF SNMP MIB 2 Interface MIB (e.g., CDP Connection ID=Switch Base MAC+ifIndex).
- In some examples, it is possible for network switches to store location information for each switch port using SNMP. A voice handset MIB allows the switch to store the ANSI LIN number for each port. This network can provision this information in the switch via SNMP sets or local command line configuration. This network can poll and/or map this information to the connection point ID information.
- 5.5 Other Miscellaneous Variations
- Other variations of the above examples can be implemented. The level of trust in the examples above is described as a discrete numerical value. One example variation is that
system 100 can employ string types and fuzzy logic techniques to implement the level of trust. For example, the levels of trust can be very trustworthy, trustworthy, not too trustworthy, neutral, untrustworthy and very untrustworthy. - Another example variation is that the illustrated processes may include additional steps. Further, the order of the steps illustrated as part of processes is not limited to the order illustrated in their figures, as the steps may be performed in other orders, and one or more steps may be performed in series or in parallel to one or more other steps, or parts thereof. For example, user verification and location verification may be performed in parallel.
- Additionally, the processes, steps thereof and various examples and variations of these processes and steps, individually or in combination, may be implemented as a computer program product tangibly as computer-readable signals on a computer-readable medium, for example, a non-volatile recording medium, an integrated circuit memory element, or a combination thereof. Such computer program product may include computer-readable signals tangibly embodied on the computer-readable medium, where such signals define instructions, for example, as part of one or more programs that, as a result of being executed by a computer, instruct the computer to perform one or more processes or acts described herein, and/or various examples, variations and combinations thereof. Such instructions may be written in any of a plurality of programming languages, for example, Java, Visual Basic, C, or C++, Fortran, Pascal, Eiffel, Basic, COBOL, and the like, or any of a variety of combinations thereof. The computer-readable medium on which such instructions are stored may reside on one or more of the components of
system 100 described above and may be distributed across one or more such components. - A number of examples to help illustrate the invention have been described. Nevertheless, it will be understood that various modifications may be made without departing from the spirit and scope of the invention. Accordingly, other embodiments are within the scope of the following claims.
Claims (16)
1. A computer-implemented method comprising:
providing data that includes location-based access control information concerning a data relay device located within a network infrastructure; and
loading the data relay device with one or more features, wherein the one or more features loaded are dependent, at least in part, upon the location-based access control information.
2. The method of claim 1 wherein the one or more features loaded includes one or more configuration files.
3. The method of claim 1 wherein the one or more features loaded includes one or more network priorities.
4. The method of claim 1 wherein the location-based access control information is dependent, at least in part, upon a transmission medium type.
5. The method of claim 4 wherein the transmission medium type includes a cable-based transmission medium.
6. The method of claim 4 wherein the transmission medium type includes a wireless transmission medium.
7. The method of claim 1 wherein the location-based access control information is dependent, at least in part, upon a physical location of the data relay device.
8. The method of claim 1 wherein the data comprises a computer file.
9. A computer program product residing on a computer readable medium having a plurality of instructions stored thereon that, when executed by a processor, cause the processor to perform operations comprising:
providing data that includes location-based access control information concerning a data relay device located within a network infrastructure; and
loading the data relay device with one or more features, wherein the one or more features loaded are dependent, at least in part, upon the location-based access control information.
10. The computer program product of claim 9 wherein the one or more features loaded includes one or more configuration files.
11. The computer program product of claim 9 wherein the one or more features loaded includes one or more network priorities.
12. The computer program product of claim 9 wherein the location-based access control information is dependent, at least in part, upon a transmission medium type.
13. The computer program product of claim 12 wherein the transmission medium type includes a cable-based transmission medium.
14. The computer program product of claim 12 wherein the transmission medium type includes a wireless transmission medium.
15. The computer program product of claim 9 wherein the location-based access control information is dependent, at least in part, upon a physical location of the data relay device.
16. The computer program product of claim 9 wherein the data comprises a computer file.
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