[ Thanks to Andrew
Weber for this link. ]
“Once you have decided you want to monitor a device with Nagios,
like a server, router, switch, printer, etc, then you will need to
take three steps for each device. This article assumes you have a
working Nagios server. The process illustrated here checking a
router is the same process you will use to check servers, switchs,
printers, etc. It is always going to be a three step process.”