Dual-port monitoring

[Israel Brewster]

I have a number of devices on my network that have dual-interfaces  
such that either one can go down, but the device itself, and all the  
devices behind it (in the case of a router) is still up and reachable.  
What is the best way to set up monitoring of such devices, considering  
that as far as I can tell you can only assign one IP per host? I have  
looked at check_cluster, but if that is the best method I am unsure of  
the best way of implementing it. Things I have thought of:

1) Create two "dummy" hosts which are the two ports, and then a third  
host with a check command of check_cluster that looks at those two  
dummy hosts. This seems overly complicated, not to mention cluttering  
up my configs and nagios interface with three hosts where there is  
really only one.

2) Simply monitor the two ports as two separate hosts. This could  
work, but again clutters things up with multiple hosts where only one  
exists, and adds the requirement of multi-parenting any child devices,  
which can get ugly, especially in a graphical representation of the  
network.

I have read http://nagios.sourceforge.net/docs/2_0/clusters.html, but  
that doesn't seem to apply, at least not directly, in that it refers  
either to situations where you have redundant services on one or more  
hosts (perhaps that is sort of what I want?) or to where you have  
multiple redundant hosts, but not to the situation where you have one  
host offering one service over two ports. The main problem with that  
doc, though, is that the cluster is always a service, which wouldn't  
work in my situation, as the host itself is a cluster. Any thoughts?  
Thanks.
-----------------------------------------------
Israel Brewster
Computer Support Technician
Frontier Flying Service Inc.
5245 Airport Industrial Rd
Fairbanks, AK 99709
(907) 450-7250 x293
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