using Nagios to detect rogue DHCP servers?

[Marc DeTrano]

The way I have done this is to run NRPE on the machine that should be
the DHCP server, with this command defined:

command[check_ndhcp]=/usr/lib/nagios/plugins/negate
/usr/lib/nagios/plugins/check_dhcp -i eth0

Something similar may work for you if your DHCP server is on a Linux
box.  This just negates the normal check_dhcp command, so that if no
offer is received (on the interface serving DHCP, it should not be), it
returns with an OK status.  If it does get an offer, a Critical is
returned and I know it is time to "seek-and-destroy".

Marc

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