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Troubleshooting a DNS server
From: James Costello <genesiswave () gmail com>
Date: Fri, 10 Sep 2010 11:36:12 -0500
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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Current thread:
- Troubleshooting a DNS server James Costello (Sep 10)
- Re: Troubleshooting a DNS server Tim Krabec (Sep 10)
- Re: Troubleshooting a DNS server James Costello (Sep 10)
- Re: Troubleshooting a DNS server Rob Michel (Sep 10)
- Re: Troubleshooting a DNS server James Costello (Sep 14)
- Re: Troubleshooting a DNS server Chris Keladis (Sep 14)
- Re: Troubleshooting a DNS server James Costello (Sep 10)
- Re: Troubleshooting a DNS server Tim Krabec (Sep 10)