Take a look at: http://argus.tcp4me.com/ http://argus.tcp4me.com/ It easy to use and quick to configure. Polls via snmp and stores in rrds. At first glance I di

Take a look at: http://argus.tcp4me.com/ http://argus.tcp4me.com/ It easy to use and quick to configure. Polls via snmp and stores in rrds. At first glance I did not like it.. but imho it beats other products in terms of simplicity. If you are looking for something bigger, then zabbix (http://www.zabbix.com/ http://www.zabbix.com/) might be an option. It is not that easy to get running, but has capabilities like dependency based notifications. For example: "Only alarm me of missing ping responses if the router of that box is reachable." I think it is a fantastic piece of software although I had to build an argus-like monitoring interface for it, so that less trained staff is able to work with it.