[quote=“patrick24601”]Oh great. Passive and active? Now I have to figure out what those mean.
The first thing I am going to do is tracert everything between me and my servers and get that all added. Then start working on services. I’d like to get the whole path laid out to where I am happy.
Don’t stop with just tracert, since that will only show you the routers between you and the device. Most times, your network trouble will be with switches, cables, port’s on a switch. Map your network out by hand on paper, and then use snmp checks on the switche ports, device port’s, to see if the port is operational. If a cable breaks, the port will go down, and now Nagios will tell you exactly what is broken. From my experience in a huge network environment, 99.9% of network trouble has been a cable needing to be replaced or reseated. Try to find this kind of trouble without Nagios, and it will take you 45 minutes to ping all the switches(that is if you even know what switches to ping). Now that you have Nagios all mapped out, you could unplug every cable in your network, and you would be able to recreate the connectivity just from your new Nagios “Status Map” link.
Nagios PC plugs into port 3 on switch1. Switch1 is trunked to switch2 via port 24. Router1 is connected to switch2 port 5. Your new nagios would monitor all IMPORTANT PORTS. You don’t really want to only check if router1 will ping. You really want to know that all cables/ports are working. See the power in monitoring/fixing your network this way? People will praise the ground you walk on, when you are done, I guarantee it.