Hello, all. If client executes recursive query, client will receive some NS records like below. $ dig www.example.com example.com. 172800 IN NS a.iana-servers.net. example.com. 172800 IN NS b.iana-servers.net.
if a.iana-servers.net. is local network and fast b.iana-servers.net. is remote network and very slow, 1. then, client querys most to a.iana-servers.net or randomly? 2. if client received NS records(a.iana-servers.net and b.iana-servers.net) from root servers, how to check which DNS is fast or slow? I can't find any icmp packets or related packets. 3. below is a cache_dump.db. Anyone can explain what's the meaning of TTL and srtt? ; J.ROOT-SERVERS.NET [v4 TTL 86393] [v4 success] [v6 unexpected] ; 192.58.128.30 [srtt 18] [flags 00000000] [ttl 1793] ; k.gtld-servers.net [v4 TTL 3] [v4 success] [v6 unexpected] ; 192.52.178.30 [srtt 9] [flags 00000000] [ttl 1793] If any RFC or related documents, please let me know. Thanks in advance. _________________________________________________________________ 클릭 한번으로 전세계 이미지가 검색됩니다. 지금 라이브 검색을 체험해보세요. http://www.live.com/?scope=images _______________________________________________ bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
