I can second the Nagios suggestion. My old job we used Nagios to monitor about 2000 servers with about 20,000 services combined. I've used it before on my own network, but it was a little overkill (like hackertarget mentioned) for my piddly 4 servers, lol, so I removed it from the network.
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-Billy
"I am using Linux every day to up my productivity - so up yours!"
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