| 摘要 |
PROBLEM TO BE SOLVED: To reduce processing load of an authority DNS server device and a cache DNS server device.SOLUTION: A distribution information storage section of an authority DNS server device stores distribution information where a subnet to which a client IP address belongs is associated with response information for responding to a DNS query request, for each domain name included in the DNS query request. A DNS query response transmission section transmits a DNS query response including the distribution information and the response information to the DNS query request to a cache DNS server device. When a DNS query request transmission section of the cache DNS server device transmits the DNS query request to the authority DNS server device, the client IP address is included in the DNS query request to be transmitted. A cache information storage section stores cache information where a domain name, the subnet to which the client IP address belongs and response information included in the DNS query response are associated with each other, in a prescribed storage section. |
