Apparatus and method of searching for DNS server in outernet

Details Apparatus and method of searching for DNS server in outernet Apparatus and method of searching for DNS server in outernet

2007-02-20

2007-02-20

Eng, David Y. (Department: 2155)

Electrical computers and digital processing systems: multicomput

Remote data accessing

Using interconnected networks

Reexamination Certificate

active

10386106

ABSTRACT:
Outernet DNS searching units are included in a host, a DNS server, a router where a DNS server is registered, and a router where a DNS server is not registered, allowing Internet-enabled terminals to automatically search for a DNS server in an outernet. The host creates a DNS search message and transmits it to a subnet to which the host belongs so as to receive a response message. If no response message is received from the subnet (i.e., a DNS server is not connected to the subnet), the DNS search message is transmitted to an outernet to which the host does not belong, to which a DNS server is connected. Further, when a DNS server does not respond to a DNS search message from a host, a hop limit is increased to resend the DNS search message, thereby preventing waste of network bandwidth and easily detecting the closest DNS server.

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