detect 2 DHCP Servers on network?

[Eli Stair]

Use CPAN's Net::DHCP::Packet to quickly create a DHCPDISCOVER packet, and
IO::Socket::INET to read raw incoming data to port 68, count the number of
DHCPOFFER's you get.  Set your script output to proper OK/WARN/CRIT state
and the number/names of "rogue" servers in the text.

Just a suggestion. 

/eli


On 7/28/06 9:40 AM, "Hari Sekhon" <hpsekhon at gmail.com> wrote:

> 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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