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DNS Logging to track

Posted on 2014-12-15
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Last Modified: 2015-03-04
I have a server 2003 running DNS in my AD. I received a report that one of my PC's is sending DNS requests to a "Sink holed" domain. I have turned on logging but not sure how to go about finding the culprit. Any help is greatly appreciated! Thanks
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Question by:eli290
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by:DLeaver
ID: 40500169
One of your PC's?

Lock down your firewall so that only the DC/DNS server(s) are sending out DNS requests to the internet.  This will stop the outbound issue.  You can then examine traffic requests coming from the PC when they hit the firewall.

Check the host file on the PC in the first instance if it is only happening to one
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by:Deadman
ID: 40500174
for DNS logging of web site access you need a proxy server solution
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by:eli290
ID: 40500209
I dont have access to my firewall since we are behind our county network. They alerted me about the DNS requests. They said to turn on DNS logging on my server to see where they originate. I turned on logging but not sure where I would even find the requests.
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by:eli290
ID: 40500221
I just installed wireshark and running a capture to see if  I can grab the info from there. I am using a capture filter of Port 53
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UnHeardOf earned 500 total points
ID: 40596415
it sounds like reverse lookup records for RFC1918 addresses are hitting the internet which are directed to black hole dns servers. RFC1918 lookups should never reach the internet. You would need to create the reverse lookup zones.

You could enable dns logging and set the options to log the following:

incoming requests
queries
udp
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