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track down the location of a machine advertising a domain or workgroup

Posted on 2008-06-24
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Under Microsoft Windows Network I can see a Domain or Workgroup listed that shouldn't be. I can't access it. I would like to track it down. How do I go about finding what machine is advertising this?
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Question by:jjc_mn
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raymondzwarts earned 500 total points
ID: 21859659
Use a packet capturing tool (like wireshark) to see who is broadcasting as master browser for the specific domain/workgroup. The packets will show up as Windows Browser Protocol and Server Message Block protocol packets.

The Packets will contain the Workgroup/Domain name and the source IP is the PC/Laptop/Server announcing the rougue domain/workgroup.

The broadcast is limited to the layer 2 subnet that the pc is on. But if you are using WINS or likewise systems in Active Directory it might take some more time to find the culprit.

Regards,
Raymond Zwarts
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by:Rob Williams
ID: 21859953
You should be able to get some information from a command line. Use DomainABC as an example domain name:
  nbtstat  -a  DomainABC
Should return a NetBIOS name list which should include a few entries such as:
ComputerName  <00>  UNIQUE
DomainABC         <00>   GROUP
It will also include the MAC address

Then ping the computer name:
     ping ComputerName
and it should return the IP address

Just a start. but it may help if you know the computer name ,MAC, and IP
If you do not get a response from the nbtstat command, or ping, it may be that the machine was temporarily connected to the network, and is no longer present. If that is the case the entry should disappear after a day or so.
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by:jjc_mn
ID: 21867270
nbtstat -a DoaminABC doesn't work.  Is the example correct?

I haven't had a change to try wireshark yet.

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Besides backup, any IT division should have a disaster recovery plan. You will find a few tips below relating to the development of such a plan and to what issues one should pay special attention in the course of backup planning.

 
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Expert Comment

by:Rob Williams
ID: 21867338
I assume you changed DomainABC to the domain name you are seeing. If it doesn't work it may have a firewall blocking the necessary ports, or possibly more likely it is no longer connected to the network.
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by:jjc_mn
ID: 21867983
I did change the name. I didn't add any slashes, just the name. Does that matter. I am doing this at a workstation, not on a server. There should be no firewall and I do see them in the GUI  Under Microsoft Windows Network.

Can you past an example?
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Author Closing Comment

by:jjc_mn
ID: 31470290
Thanks
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Best Practices: Disaster Recovery Testing

Besides backup, any IT division should have a disaster recovery plan. You will find a few tips below relating to the development of such a plan and to what issues one should pay special attention in the course of backup planning.

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