Mailing List CGatePro@mail.stalker.com Message #101635
From: Brian Gibson <gibson_brian@wheatoncollege.edu>
Subject: Re: help with DNS issue
Date: Mon, 21 Feb 2011 09:55:40 -0500
To: CommuniGate Pro Discussions <CGatePro@mail.stalker.com>
Hi Lyle,

The DNS server that is having problems resolving is a Windows 2008 domain controller so I do not have dig available to me, just nslookup it seems. What I did do was run the dig +trace from the CGPro Linux server  (who is set to look at the domain controller fro DNS queries) and from what I can tell mail-gw.dis.dk resolves ok, see below

---------------------------------------------------------------------
[root@xmail ~]# dig +trace mail-gw.dis.dk

; <<>> DiG 9.2.4 <<>> +trace mail-gw.dis.dk
;; global options:  printcmd
.                       61458   IN      NS      g.root-servers.net.
.                       61458   IN      NS      i.root-servers.net.
.                       61458   IN      NS      j.root-servers.net.
.                       61458   IN      NS      a.root-servers.net.
.                       61458   IN      NS      m.root-servers.net.
.                       61458   IN      NS      f.root-servers.net.
.                       61458   IN      NS      k.root-servers.net.
.                       61458   IN      NS      l.root-servers.net.
.                       61458   IN      NS      b.root-servers.net.
.                       61458   IN      NS      e.root-servers.net.
.                       61458   IN      NS      h.root-servers.net.
.                       61458   IN      NS      c.root-servers.net.
.                       61458   IN      NS      d.root-servers.net.
;; Received 501 bytes from 155.47.64.174#53(155.47.64.174) in 1 ms

dk.                     172800  IN      NS      c.nic.dk.
dk.                     172800  IN      NS      b.nic.dk.
dk.                     172800  IN      NS      l.nic.dk.
dk.                     172800  IN      NS      p.nic.dk.
dk.                     172800  IN      NS      a.nic.dk.
dk.                     172800  IN      NS      s.nic.dk.
;; Received 312 bytes from 192.112.36.4#53(g.root-servers.net) in 209 ms

dis.dk.                 86400   IN      NS      authns1.webpartner.dk.
dis.dk.                 86400   IN      NS      authns2.webpartner.dk.
;; Received 119 bytes from 208.76.168.244#53(c.nic.dk) in 26 ms

mail-gw.dis.dk.         900     IN      A       130.226.234.238
dis.dk.                 900     IN      NS      authns2.webpartner.dk.
dis.dk.                 900     IN      NS      authns1.webpartner.dk.
;; Received 103 bytes from 213.150.60.234#53(authns1.webpartner.dk) in 95 ms
---------------------------------------------------------------------



On 2/21/2011 9:49 AM, Lyle Giese wrote:
Brian Gibson wrote:
Hi all,

We are having an issue sending a message because of DNS and I am kind of baffled as to why. A message in the queue is destined for the domain dis.dk but I am getting the following message in the queue

Failed to deliver to 'amo@dis.dk'
SMTP module(domain dis.dk) reports:
 dis.dk: DNS server failure

The /etc/resov.conf on the CGPro server looks like this

search wheatonma.edu
nameserver 155.47.64.174
nameserver 155.47.105.40


The 2 DNS servers are our Windows domain controllers. If I query dis.dk against the first I get nothing, if I query dis.dk against the second it does resolve (see dig results below). Any ideas on how to troubleshoot whether this is something wrong with our DNS server or something happening higher up with the recursive queries?


[root@xmail ~]# dig dis.dk @155.47.64.174

; <<>> DiG 9.2.4 <<>> dis.dk @155.47.64.174
; (1 server found)
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 42008
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;dis.dk.                                IN      A

;; Query time: 0 msec
;; SERVER: 155.47.64.174#53(155.47.64.174)
;; WHEN: Mon Feb 21 09:16:40 2011
;; MSG SIZE  rcvd: 24

[root@xmail ~]# dig dis.dk @155.47.105.40

; <<>> DiG 9.2.4 <<>> dis.dk @155.47.105.40
; (1 server found)
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 44900
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;dis.dk.                                IN      A

;; ANSWER SECTION:
dis.dk.                 689     IN      A       74.53.248.36

;; Query time: 0 msec
;; SERVER: 155.47.105.40#53(155.47.105.40)
;; WHEN: Mon Feb 21 09:16:52 2011
;; MSG SIZE  rcvd: 40

I would do a dig +trace mail-gw.dis.dk from the server having problems resolving this.

Lyle Giese
LCR Computer Services, Inc.


-- 



++++++++++++++++++++++++++++
Brian Gibson
Systems Administrator
Wheaton College

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