United States Patent  [ii] Patent Number: 5,777,989
McGarvey  Date of Patent: Jul. 7, 1998
 TCP/IP HOST NAME RESOLUTION FOR MACHINES ON SEVERAL DOMAINS
 Inventor: John Ryan McGarvey, Apex, N.C.
 Assignee: International Business Machines Corporation. Armonk. N.Y.
 Appl. No.: 574*488
 Filed: Dec 19, 1995
 Int. CI.6 H04L 12/26
 U.S. CI 370/254; 370/475; 395/20079
 Field of Search 370/254-258.
370/392. 475; 395/200.11. 20079
 References Cited
U.S. PATENT DOCUMENTS
4,853,843 8/1989 Ecklund 364/200
4,893,307 1/1990 McKay et al 370/466
5,021,942 6/1991 Watson et al 364/200
5,142,622 8/1992 Owens 395/200
5,617,540 4/1997 Civanlar et al 395/200.11
■Domain Names—Concepts and FacilitiesB by P. Mockapetris. IBM RFC1034, Nov.. 1987; available on Internet World Wide Web at FTP address nic.ddn.mil or nisc.junc.net.
Primary Examiner—Melvin Marcelo
Attorney, Agent, or Firm—Jeanine S. Ray-Yarletts
This invention deals with an enhancement to the name resolution capabilities of existing TCP/IP networks. More specifically, it allows a host which is connected to a private network to be located through a connection to a different private network or a public network, such as the internet. This is achieved by allowing the host to be configured with more than one primary domain name server. This can be done using existing TCP/IP communications protocol and does not require a change to any code outside of the host. The host can also define one or more alternate domain name servers for each of the primary domain name servers. The definition of multiple primary and secondary domain name servers for each host allows the name of the host to be located, without a degradation in performance, if it is located or defined in any of the primary domain name servers.
10 Claims, 3 Drawing Sheets