Address query response method, program, and apparatus, and...

Details Address query response method, program, and apparatus, and... Address query response method, program, and apparatus, and...

2004-01-13

2008-08-19

Patel, Ashok (Department: 2154)

Electrical computers and digital processing systems: multicomput

Computer-to-computer data addressing

C398S009000, C398S016000, C707S793000, C707S793000, C707S793000, C707S793000, C707S793000, C707S793000, C714S741000, C714S742000, C714S743000, C714S748000, C715S734000

Reexamination Certificate

active

07415536

ABSTRACT:
Upon reception of a query about the address of a server from a client, a DNS server sends a query about the address of that server to an external DNS server. The DNS server checks based on the address obtained from the external DNS server if connection to the server can be established. If connection to the server cannot be established, and the DNS server receives a query about the address of the server, the DNS server returns a response indicating that the address is not available. When the address is returned before the check process, the DNS sever sets an expiration time shorter than that of the address of the server obtained from the external DNS server as the expiration time of the address of the server.

REFERENCES:
patent: 5459837 (1995-10-01), Caccavale
patent: 2002/0059622 (2002-05-01), Grove et al.
patent: 2002/0169890 (2002-11-01), Beaumont et al.
patent: 2006/0020688 (2006-01-01), Chang et al.
patent: 2002-261794 (2002-09-01), None
patent: 02/39699 (2002-05-01), None
Partial European Search Report.
Japanese Office Action (with partial English translation) dated Apr. 19, 2005 of basic Japanese Patent Appln. No. 2003-012283.

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