I have been wanting to get some sort of network monitor running at home for quite some time. I had tried NAGIOS and it was just too much of a pain to get running. I found Observium (http://www.observium.org/) and decided to give it a try. So far I like it. It monitors SNMP devices and I have quite a few of those on my network. The thing I like most is the price for the Community version – FREE! I was able to get the software up and running rather quickly with a TurnKeyLinux download (https://www.turnkeylinux.org/observium).
Just for future reference, here are the commands I used to find devices that supported SNMP on my network and the command used to add a host to Observium.
nmap -sU -p161 –script snmp-brute –script-args snmplist=community.lst 192.168.0.0/24
snmpget -v2c -c public hostname.network sysDescr.0
/opt/observium/add_device.php hostname.network public v2c 161 udp