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Rogue Subnet

Posted on 2010-11-29
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Last Modified: 2012-05-10
Recently switched our network from 192.168.2.x to 10.2.1.x and I'm still getting a 192.168.2.0 subnet address that is causing some major headaches here. Anyone know of an easy way to locate this subnet and shut it down?
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Question by:telstar_
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moon_blue69 earned 500 total points
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by:qbakies
ID: 34231882
What do you mean 'still getting"?  Are machines still getting DHCP in the 192.168.2.0 range?  
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by:telstar_
ID: 34231892
The 192.168.2.0 range is causing routing issues with another one of our offices in another part of the country.
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by:fluk3d
ID: 34231919
Go to one of your machines that is getting the IP address (192.168.2.0) and run an ipconfig/all it will tell you the DHCP server IP address.

GO to the machine either RDP/VNC/Physically and disable the dhcp service/remove the scope or what not.
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by:frederi
ID: 34232161
If your switches supports that function you can also block any DHCP other than the one you specify.
I can't remember the exact name of the function in general. On procurve switches it's called DHCP-snooping.
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