Re: Troubleshooting a DNS server

[Tim Krabec <tkrabec () gmail com>]

setup verbose logging or do a packet capture & get the IP's from there

On Fri, Sep 10, 2010 at 12:36 PM, James Costello <genesiswave () gmail com>wrote:

> I am in the process of shutting down an old DNS for my employer andhave
> been told that I can't shut it down until it stops getting queried from
> other servers.  I am down to a hand full of Linux servers that are still
> making a couple of queries per hour apiece.  The servers /etc/resolv.conf
> have been updated to point to the new servers but there is an application or
> process that is continuing to contact the old servers for resolution.
> I have tried narrowing it down by the query and was able to eliminate a
> couple of servers with NTPD running that needed the daemon restarted to
> clear the cache, but a few more of the servers are making very general
> requests i.e. internaldomain.com.
> I am looking at using lsof to query for the service but am not having much
> luck at the moment.  Below is the command I am using on the servers that are
> making the query:
> lsof -i @192.168.1.2 UDP:53 -n -r1
>
> I am not overly familiar with lsof so please provide feedback.
> If anyone has a suggestion for an alternate command or utility to use on a
> Linux box, I'd be appreciative.
> I used TCPView from SysInternals on the Windows boxes to perform this task
> but have not found anything to do this other than lsof.  (though that could
> be a limitation of the searches I have made on Google).
>
> Thanks,
> James
>
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-- 
Tim Krabec
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