[TriLUG] What could be going on with my nameserver?
Rick DeNatale
rick.denatale at gmail.com
Tue Nov 1 11:31:36 EST 2005
I'm plagued by what looks like an intermittent problem with my nameserver setup.
I'm running bind9 as a cacheing name server, and to resolve local
addresses on my LAN.
>From time to time, resolution of internet names seems to stop for a
while. Sometimes it's all external names, and sometimes it's only
some. For example, right now I can resolve www.google.com, but not
en.wikipedia.org.
The bind configuration has a forward first directive, and a forwarders
directive to forward to my netgear router which in turn forwards to
the name servers it gets from my isp via dhcp. The router's local ip
address is 192.168.0.11
Here's some recent attempts to figure out what's going on using dig.
rick at frodo:~$ dig www.google.com
; <<>> DiG 9.2.4 <<>> www.google.com
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 49965
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 5, ADDITIONAL: 5
;; QUESTION SECTION:
;www.google.com. IN A
;; ANSWER SECTION:
www.google.com. 310 IN CNAME www.l.google.com.
www.l.google.com. 270 IN A 64.233.161.99
www.l.google.com. 270 IN A 64.233.161.104
www.l.google.com. 270 IN A 64.233.161.147
;; AUTHORITY SECTION:
l.google.com. 19999 IN NS e.l.google.com.
l.google.com. 19999 IN NS a.l.google.com.
l.google.com. 19999 IN NS b.l.google.com.
l.google.com. 19999 IN NS c.l.google.com.
l.google.com. 19999 IN NS d.l.google.com.
;; ADDITIONAL SECTION:
a.l.google.com. 158 IN A 216.239.53.9
b.l.google.com. 154 IN A 64.233.179.9
c.l.google.com. 159 IN A 64.233.161.9
d.l.google.com. 24178 IN A 64.233.183.9
e.l.google.com. 160 IN A 66.102.11.9
;; Query time: 72 msec
;; SERVER: 192.168.0.40#53(192.168.0.40)
;; WHEN: Tue Nov 1 11:14:38 2005
;; MSG SIZE rcvd: 260
rick at frodo:~$ dig en.wikipedia.org
; <<>> DiG 9.2.4 <<>> en.wikipedia.org
;; global options: printcmd
;; connection timed out; no servers could be reached
rick at frodo:~$ dig @192.168.0.11 en.wikipedia.org
; <<>> DiG 9.2.4 <<>> @192.168.0.11 en.wikipedia.org
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2577
;; flags: qr rd ra; QUERY: 1, ANSWER: 16, AUTHORITY: 3, ADDITIONAL: 3
;; QUESTION SECTION:
;en.wikipedia.org. IN A
;; ANSWER SECTION:
en.wikipedia.org. 1288 IN CNAME rr.wikimedia.org.
rr.wikimedia.org. 175 IN CNAME rr.pmtpa.wikimedia.org.
rr.pmtpa.wikimedia.org. 1222 IN A 207.142.131.246
rr.pmtpa.wikimedia.org. 1222 IN A 207.142.131.247
rr.pmtpa.wikimedia.org. 1222 IN A 207.142.131.248
rr.pmtpa.wikimedia.org. 1222 IN A 207.142.131.202
rr.pmtpa.wikimedia.org. 1222 IN A 207.142.131.203
rr.pmtpa.wikimedia.org. 1222 IN A 207.142.131.204
rr.pmtpa.wikimedia.org. 1222 IN A 207.142.131.205
rr.pmtpa.wikimedia.org. 1222 IN A 207.142.131.206
rr.pmtpa.wikimedia.org. 1222 IN A 207.142.131.210
rr.pmtpa.wikimedia.org. 1222 IN A 207.142.131.213
rr.pmtpa.wikimedia.org. 1222 IN A 207.142.131.214
rr.pmtpa.wikimedia.org. 1222 IN A 207.142.131.235
rr.pmtpa.wikimedia.org. 1222 IN A 207.142.131.236
rr.pmtpa.wikimedia.org. 1222 IN A 207.142.131.245
;; AUTHORITY SECTION:
wikimedia.org. 72805 IN NS ns1.wikimedia.org.
wikimedia.org. 72805 IN NS ns2.wikimedia.org.
wikimedia.org. 72805 IN NS ns0.wikimedia.org.
;; ADDITIONAL SECTION:
ns0.wikimedia.org. 19250 IN A 207.142.131.207
ns1.wikimedia.org. 45396 IN A 207.142.131.208
ns2.wikimedia.org. 45396 IN A 145.97.39.158
;; Query time: 109 msec
;; SERVER: 192.168.0.11#53(192.168.0.11)
;; WHEN: Tue Nov 1 11:20:12 2005
;; MSG SIZE rcvd: 410
rick at frodo:~$ dig www.google.com
; <<>> DiG 9.2.4 <<>> www.google.com
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 6779
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 5, ADDITIONAL: 5
;; QUESTION SECTION:
;www.google.com. IN A
;; ANSWER SECTION:
www.google.com. 822 IN CNAME www.l.google.com.
www.l.google.com. 231 IN A 64.233.161.99
www.l.google.com. 231 IN A 64.233.161.104
www.l.google.com. 231 IN A 64.233.161.147
;; AUTHORITY SECTION:
l.google.com. 19659 IN NS e.l.google.com.
l.google.com. 19659 IN NS a.l.google.com.
l.google.com. 19659 IN NS b.l.google.com.
l.google.com. 19659 IN NS c.l.google.com.
l.google.com. 19659 IN NS d.l.google.com.
;; ADDITIONAL SECTION:
a.l.google.com. 86247 IN A 216.239.53.9
b.l.google.com. 86248 IN A 64.233.179.9
c.l.google.com. 86248 IN A 64.233.161.9
d.l.google.com. 23838 IN A 64.233.183.9
e.l.google.com. 86248 IN A 66.102.11.9
;; Query time: 140 msec
;; SERVER: 192.168.0.40#53(192.168.0.40)
;; WHEN: Tue Nov 1 11:20:18 2005
;; MSG SIZE rcvd: 260
So I can get google resolved via my local nameserver, but I can only
resolve en.wikipedia.org if I bypass the local nameserver and go
directly to the netgear router.
As I said these problems seem to come and go. Resolution of local
names seems solid (they're all in a local subdomain
local.denhaven2.com). Restarting bind doesn't seem to make a
difference.
Any ideas?
--
Rick DeNatale
Visit the Project Mercury Wiki Site
http://www.mercuryspacecraft.com/
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