Spurious DNS servers

[Vertigo]

Come into the office this morning and one machine is having issues resolving addresses.

Turns out that a couple of spurious DNS servers have appeared against the network adapter and I've no idea where from or how to get rid of them. The machine is on DHCP. If I try manually setting the DNS server for the adapter, it appears after the spurious ones.

Anyone have any ideas?

 

[nutcase]

Someone has plugged a home router in? Do you have DHCP snooping enabled - that should have prevented the effect.