On Dec 3, 2009, at 3:38 AM, Tech W. wrote: > # dig smartip.gduf.edu.cn ns +short > dtone1.gduf.edu.cn. > > # dig www.smartip.gduf.edu.cn +short > 121.8.235.88 > > # dig www.smartip.gduf.edu.cn +trace
[...] > www.smartip.gduf.edu.cn. 8 IN A 218.192.12.4 > www.smartip.gduf.edu.cn. 8 IN A 218.192.12.10 > www.smartip.gduf.edu.cn. 8 IN A 218.192.12.3 > ;; Received 89 bytes from 218.192.12.6#53(DNS.gduf.edu.cn) in 106 ms DNS.gduf.edu.cn is open to recursive queries from anyone. Is it possible you were seeing a cached answer? A DNS server that is authoritative for a zone that has subzones that are delegated to other DNS servers should not be performing recursion. Not for anyone. It leads to confusing results. $ dig www.smartip.gduf.edu.cn +norec @DNS.gduf.edu.cn ; <<>> DiG 9.6.0-APPLE-P2 <<>> www.smartip.gduf.edu.cn +norec @DNS.gduf.edu.cn ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 22315 ;; flags: qr ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1 ;; QUESTION SECTION: ;www.smartip.gduf.edu.cn. IN A ;; AUTHORITY SECTION: smartip.gduf.edu.cn. 3600 IN NS dtone1.gduf.edu.cn. ;; ADDITIONAL SECTION: dtone1.gduf.edu.cn. 3600 IN A 218.192.12.233 ;; Query time: 398 msec ;; SERVER: 218.192.12.6#53(218.192.12.6) ;; WHEN: Thu Dec 3 08:43:50 2009 ;; MSG SIZE rcvd: 97 $ dig www.smartip.gduf.edu.cn +norec @dtone1.gduf.edu.cn ; <<>> DiG 9.6.0-APPLE-P2 <<>> www.smartip.gduf.edu.cn +norec @dtone1.gduf.edu.cn ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 47739 ;; flags: qr aa; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 0 ;; QUESTION SECTION: ;www.smartip.gduf.edu.cn. IN A ;; ANSWER SECTION: www.smartip.gduf.edu.cn. 30 IN A 121.8.235.88 ;; AUTHORITY SECTION: smartip.gduf.edu.cn. 3600 IN NS dtone1.gduf.edu.cn. ;; Query time: 396 msec ;; SERVER: 218.192.12.233#53(218.192.12.233) ;; WHEN: Thu Dec 3 08:44:17 2009 ;; MSG SIZE rcvd: 78 Chris Buxton Professional Services Men & Mice _______________________________________________ bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
