detect 2 DHCP Servers on network?

[Hari Sekhon]

I was wondering what the best way of detecting a rogue dhcp server on 
the network is.


I ask because some idiot at work installed vmware with it's dhcp server 
which stuffed the company laptops which rely on dhcp since they got sent 
to the wrong subnet.

Nagios actually drew my attention to this when troubleshooting because 
it said 2 DHCP offers received.

I'm thinking about writing a shell wrapper to parse the output from the 
check_dhcp plug-in and raise a warning status if it returns more than 1 
dhcp offer.

Any other ideas?


Hari


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