On 07/25/11 09:22, Sathyan Arjunan (sarjunan) [CONTRACTOR] wrote:
Recent days, I am facing frequent caching issues with my DNS servers
which are responsible for recursive lookup to external queries. As a
temporary solution, we used to refresh the named daemon to clear the
cache. To isolate this issue we upgraded the BIND to “BIND 9.7.3” but
even after the upgrade issue repeats.
If I do a nslookup for “*mail.sin.gpi-g.com*”, it fails.
*nslookup mail.sin.gpi-g.com**
*Server: dnsserver
Address: x.x.x.x#53
*** server can't find mail.sin.gpi-g.com: SERVFAIL*
To fix this I have to restart the named daemon in caching DNS server.
Once I restart, the lookup resolves well. However the issue appears
again in few days. Any thoughts?
nslookup mail.sin.gpi-g.com
Server: dnsserver
Address: x.x.x.x#53
Non-authoritative answer:
Name: mail.sin.gpi-g.com
Address: 203.175.163.180
Regards,
--Sathyan
Simple ask both nameservers for the domain sin.gpi-g.com and you get
different answers. They have serious DNS problems.
Lyle Giese
LCR Computer Services, Inc.
dig @192.5.6.30 sin.gpi-g.com
; <<>> DiG 9.7.3 <<>> @192.5.6.30 sin.gpi-g.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 24506
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 2
;; WARNING: recursion requested but not available
;; QUESTION SECTION:
;sin.gpi-g.com. IN A
;; AUTHORITY SECTION:
gpi-g.com. 172800 IN NS nameserver1.gpi-g.com.
gpi-g.com. 172800 IN NS nameserver2.gpi-g.com.
;; ADDITIONAL SECTION:
nameserver1.gpi-g.com. 172800 IN A 202.169.51.115
nameserver2.gpi-g.com. 172800 IN A 202.182.61.51
;; Query time: 95 msec
;; SERVER: 192.5.6.30#53(192.5.6.30)
;; WHEN: Mon Jul 25 19:15:22 2011
;; MSG SIZE rcvd: 115
dig @202.169.51.115 mail.sin.gpi-g.com
; <<>> DiG 9.7.3 <<>> @202.169.51.115 mail.sin.gpi-g.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 6393
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1
;; WARNING: recursion requested but not available
;; QUESTION SECTION:
;mail.sin.gpi-g.com. IN A
;; ANSWER SECTION:
mail.sin.gpi-g.com. 38400 IN A 203.175.163.180
;; AUTHORITY SECTION:
sin.gpi-g.com. 38400 IN NS nameserver2.gpi-g.com.
;; ADDITIONAL SECTION:
nameserver2.gpi-g.com. 14400 IN A 202.182.61.51
;; Query time: 300 msec
;; SERVER: 202.169.51.115#53(202.169.51.115)
;; WHEN: Mon Jul 25 19:15:48 2011
;; MSG SIZE rcvd: 94
dig @202.182.61.51 mail.sin.gpi-g.com
; <<>> DiG 9.7.3 <<>> @202.182.61.51 mail.sin.gpi-g.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 3923
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
;; WARNING: recursion requested but not available
;; QUESTION SECTION:
;mail.sin.gpi-g.com. IN A
;; Query time: 301 msec
;; SERVER: 202.182.61.51#53(202.182.61.51)
;; WHEN: Mon Jul 25 19:16:02 2011
;; MSG SIZE rcvd: 36
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