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Simple Network Traffic Observation

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robo_dev

1) Ipswitch Whats up gold
2) PRTG

Of course that's not open source, but PRTG will do some things with no license.

There are some technical hurdles to cross to do all of what you are asking, mainly:

a) On a switched network, you only see broadcast traffic unless you do port mirroring or use a hub between a switched port and the server or workstation you want to sniff.

b) At a high level, a lot of what you need can be done with SNMP. The quickest and easiest way to do this is with a vendor utility (some are free like Cisco Network Assistant). It takes more work to setup a third-party SNMP utility like PRTG.