Nagios plug-in for monitoring ISC DHCP

Loren M. Lang lorenl at
Sun Mar 18 01:07:57 UTC 2012

I am using a Nagios plug-in called check_dhcp to monitor both my DHCP 
servers.  It works by broadcasting a DHCPDISCOVER message and monitoring 
any DHCPOFFERs.  It reports back a Warning status if not all DHCP 
servers respond and a Critical status if no one responds.  The problem I 
am having is that the Nagios server is running on the same hardware as 
one of the DHCP servers and it does not seem to respond to the 
DHCPDISCOVER.  I can successfully run the plug-in on a separate computer 
to get it to respond, but I'd like to test it from the same server 
running all the Nagios checks.  Is it possible to send a DHCPDISCOVER to 
the daemon running on the same computer without using a separate network 
card tied to the network?

Loren M. Lang
lorenl at

Public Key:
Fingerprint: 10A0 7AE2 DAF5 4780 888A  3FA4 DCEE BB39 7654 DE5B

More information about the dhcp-users mailing list