On Thu, Oct 21, 2010 at 7:26 AM, Jethro R Binks
<jethro.binks@???> wrote:
> As far as I can see from debugging, the resolver is behaving strangely,
> but I do not understand why, and I know there are cleverer minds here.
This reverse DNS is badly configured.
Running dig +tra 5.131.80.194.in-addr.arpa ptr reveals uwrz02 throwing
the same records over & over again. Here's a snippet.
131.80.194.in-addr.arpa. 85988 IN NS uwrz02.wales.ac.uk.
131.80.194.in-addr.arpa. 85988 IN NS uwrz04.wales.ac.uk.
;; Received 128 bytes from 194.80.131.2#53(uwrz02.wales.ac.uk) in 111 ms
131.80.194.in-addr.arpa. 85988 IN NS uwrz04.wales.ac.uk.
131.80.194.in-addr.arpa. 85988 IN NS uwrz02.wales.ac.uk.
;; Received 128 bytes from 194.80.131.2#53(uwrz02.wales.ac.uk) in 117 ms
131.80.194.in-addr.arpa. 85987 IN NS uwrz02.wales.ac.uk.
131.80.194.in-addr.arpa. 85987 IN NS uwrz04.wales.ac.uk.
;; Received 128 bytes from 194.80.131.2#53(uwrz02.wales.ac.uk) in 111 ms
131.80.194.in-addr.arpa. 85987 IN NS uwrz04.wales.ac.uk.
131.80.194.in-addr.arpa. 85987 IN NS uwrz02.wales.ac.uk.
;; Received 128 bytes from 194.80.131.2#53(uwrz02.wales.ac.uk) in 123 ms
There is something wrong with uwrz02.wales.ac.uk:
[root@cokecan samba]# dig @uwrz02.wales.ac.uk 131.80.194.in-addr.arpa. ptr
; <<>> DiG 9.3.4-P1 <<>> @uwrz02.wales.ac.uk 131.80.194.in-addr.arpa. ptr
; (1 server found)
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 27465
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;131.80.194.in-addr.arpa. IN PTR
;; Query time: 2315 msec
;; SERVER: 194.80.131.2#53(194.80.131.2)
;; WHEN: Thu Oct 21 08:02:03 2010
;; MSG SIZE rcvd: 41
I can't even reach uwrz04:
[root@cokecan samba]# dig @uwrz04.wales.ac.uk 131.80.194.in-addr.arpa. ptr
; <<>> DiG 9.3.4-P1 <<>> @uwrz04.wales.ac.uk 131.80.194.in-addr.arpa. ptr
; (1 server found)
;; global options: printcmd
;; connection timed out; no servers could be reached
I'm in the southeast USA, so if this is location-specific (e.g.
anycasting or load-balancing), it may be hard to troubleshoot.
But it doesn't look like it's just you or your exim ;)
--
HTH, YMMV, HANW :)
Jason
The path to enlightenment is /usr/bin/enlightenment.
