Are there any open-source simple network monitoring applications? [duplicate]

Posted by scottm on Server Fault See other posts from Server Fault or by scottm
Published on 2009-07-10T15:18:03Z Indexed on 2014/06/10 21:29 UTC
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Windows

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networking

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monitoring

This question already has an answer here:

What tool do you use to monitor your servers? 73 answers

I am debugging a problem with one of our systems. Every Sunday, it stops communicating with another server. If we reboot both servers, communication works again.

I was wondering if there are any small footprint apps that monitor TCP port availability and network connectivity, possibly logging any downtime. I'd also like it to be open source if possible, but if there is another solution that is proprietary, I'd like to hear about it also.

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