Mahesh K Totapally

US Patent:

6351743, Feb 26, 2002

Filed:

May 26, 1999

Appl. No.:

09/318908

Inventors:

Carmen Edward DeArdo - Pickerington OH
Timothy John Larson - Pickerington OH
Gordon Thomas Spencer - Gahanna OH
Mahesh Kumar Totapally - Reynoldsburg OH

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G06F 1730

US Classification:

707 3, 707 5, 707 10, 707200, 709203, 709219, 711117, 711118

Abstract:

A domain name server, DNS, for Internet Protocol or Intranet Protocol networks, that has a non-cached domain name server connected to a cached domain name server, and a query server that is connected to both the non-cached DNS and the cached DNS. The query server balances the query load between the DNSs. The query server compares counts of outstanding queries of each DNS and assigns the next query to the DNS with the fewer outstanding counts, unless the query is a special type known as an authoratative query. All authoratative queries are processed by the non-cached DNS. This is because the DNS information stored in the non-cached server is more carefully updated so its information has a higher level of correctness than the information in the cached DNS. Periodic updating of the non-cached DNS keeps its information at this higher level of correctness. The cached DNS runs a little faster because its domain name information updating is simpler than the non-cached DNS, but the chances for a DNS error or stale node address are higher.