check_dhcp on localhost

[Jan Kohnert]

Hello folks,

I got Nagios-1.4.1 on Gentoo up and running using the fine documentation and
the template config files which I could easily edit to fit my needs.

But I ran into trouble with one single service:
I do:
server ~ # /usr/nagios/libexec/check_dhcp -v -s localhost -i eth0
DHCP socket: 3
Hardware address: 0050223937b4
DHCPDISCOVER to 255.255.255.255 port 67
DHCPDISCOVER XID: 162470487 (0x9AF1A57)
DHCDISCOVER ciaddr:  0.0.0.0
DHCDISCOVER yiaddr:  0.0.0.0
DHCDISCOVER siaddr:  0.0.0.0
DHCDISCOVER giaddr:  0.0.0.0
send_dhcp_packet result: 548




No (more) data received
Result=ERROR
Total responses seen on the wire: 0
Valid responses for this machine: 0
DHCP problem: No DHCPOFFERs were received.
server ~ #

but at the same time in my logs:
Jun 26 17:42:44 server dhcpd: DHCPDISCOVER from 00:50:22:39:37:b4 via eth0
Jun 26 17:42:45 server dhcpd: DHCPOFFER on 192.168.0.236 to 00:50:22:39:37:b4
via eth0

I tested on another host on my LAN and it works just fine. But that is not a
solution for monitoring, because non of this clients is up all the time and I
want the services to be checked 24x7.

So I searched the web for a solution but I only found a french forum at wich
this was once discussed. Unfortunately I don't speak french. ;)

So I'd like to ask your help:
Is it possible to monitor a dhcp server which is running on the same machine
as nagios? And if yes, how to do that? Add a iptables rule to route back the
DHCPOFFER or should it work out of the box?

-- 
MfG Jan

Open WebMail Project (http://openwebmail.org)


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