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DNS Tracing

Posted on 2014-11-12
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Last Modified: 2014-12-09
I have an unusual issue where I have a DNS entry from a vmware server that seems to be getting a bad DNS entry. So at some point I imagine it had a bad entry. When I change the entry it seems to be good for a bit but then it reverts back to the old one. It's a pretty small IT team so it would appear it's like a server with the old entry is somehow publishing the old/bad entry as newer.

Is there any way to trace on a DNS server where an entry came from and see where things are going to?
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Question by:Brandon_V
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by:OriNetworks
ID: 40437969
Where are you seeing the old dns entry? I'm not sure if you mean an old dns record is listed in a zone or if a client is getting a DNS server assigned via DHCP to use when looking up DNS records.

For loggings at the DNS Server level:
Open DNS, rightclick the root and select properties
Under Debug Logging tab select Log packets and select your required options from there.
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by:Brandon_V
ID: 40438094
so for example I have
a record that looks like below

ServerA IP: 10.1.1.1

The DNS record SHOULD be ServerA IP: 10.1.1.2

So if I change the record so there is a static entry that says ServerA IP: 10.1.1.2 what is happening is say 2-3 hours later it is back to being ServerA IP: 10.1.1.1

just side bar info the DNS is an Active Directory integrated DNS zone
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by:OriNetworks
ID: 40440263
if you do ipconfig on serverA is 10.1.1.2 the only IP address assigned?

If any other network interfaces exists it may request a new address from DHCP. Also, if you have multiple DNS servers you should probably make sure it is deleted on all or make sure DNS is correctly synchronizing between DNS servers
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Author Comment

by:Brandon_V
ID: 40447249
Nop single NIC, no other interfaces picking up  the bad IP.
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by:OriNetworks
ID: 40450677
Does the ipconfig command list any additional ip addresses assigned to the interface?
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by:Brandon_V
ID: 40450813
No it doesn't. I did find the issue, which is someone had configured the servers ILO to have the same name as the host. So when it updated DNS it messed it up.

Still though is there a way to setup the logging so that I could have seen that an update from Server X had the update or that the update came from hardware Address XXXXXXXX in the environment for example ?
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OriNetworks earned 1500 total points
ID: 40474424
The only way I am aware of being able to find that information is to setup debugging as I described. It is low level information and it would give you the information you are looking for. Additionally there may be other utilities out there to help parse the results.
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