unknown workgroups/domains in our network

Please help, when I browse to My Network Places|Entire Network|Microsoft Windows Network I can see my domain. The problem is that other domains or workgroups periodically appear as though someone has plugged in to our network. For instance, today I can see Alfeld, Dky and Wilmar. We don't have WiFi. Can anyone please tell me if there is any way to find out where this Workgroup/Domain is coming from? and how to block them? Thank you in advance.
weikiiroAsked:
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d_williaConnect With a Mentor Commented:
As Yaniv said, checking your DHCP server for unknown stations is a good start.  If you have a WINS server, it will show you exactly what devices are advertising what workgroups as long as they are configured to use WINS.
Failing those suggestions, there are a couple packet sniffers out there that can sniff for NBT Traffic.  Go to www.ethereal.com or www.wireshark.org and download either one.  Run it on a computer that can see these rogue workgroups.  After a few minutes, you should have a good sample to parse through to find the IP addresses of the offenders.
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d_williaCommented:
You likely have other computers connected to your network that are not members of your domain, but their own workgroups.  Likely Windows XP Home or earlier machines.
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weikiiroAuthor Commented:
Is there any way I can find out what is their IP address or any informations?
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Yaniv_HoobianConnect With a Mentor Commented:
Check the DHCP for unknown stations

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Yaniv_HoobianConnect With a Mentor Commented:
You can also try using Look@Lan or the newer Fing

http://www.lookatlan.com/

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