[Nagiosplug-devel] [ nagiosplug-Patches-1218235 ] unicast support for check_dhcp

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Wed Jul 11 17:38:12 CEST 2007

Patches item #1218235, was opened at 2005-06-10 15:49
Message generated for change (Comment added) made by hweiss
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Category: Enhancement
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Andreas Ericsson (ageric)
>Assigned to: Holger Weiss (hweiss)
Summary: unicast support for check_dhcp

Initial Comment:
Heiti Ernits, an employee at Boras Kommun has added
unicast support to the check_dchp plugin. I reworked it
a bit to be more general and removed the hardcoded
stuff. I also added detection of ones own IP-address to
use for the return route.

It gives check_dhcp the ability to mimic a dhcp-relay
server, which use unicast when talking to the server
and therefore can be used to query dhcp-servers on
separate and even remote subnets. There are routing
rules ofcourse. Querying a dhcp-server with ip on subnet A from on subnet B
won't work, as the dhcp-server then will redirect its
responses to a host on the same subnet (which may or
may not exist) rather than the correct server. Sane
networks probably won't suffer from it, and it may be
possible to work around it (although I can't imagine how).

Apply with patch -p1 < nagiosplug-check_dhcp-unicast.diff


>Comment By: Holger Weiss (hweiss)
Date: 2007-07-11 17:38

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Thank you very much.  I hope I'll find the time to look into the patch and
test it Really Soon Now[tm].



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