Does somebody know about some software for network analysis like Solarwinds Lansurveyor or Cheops-ng? It must be freeware or opensource and would be great if it will have support also for SNMP.

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I googled it and read the results but I still don’t get what it is. Could somebody easily explain? :S

I know I can use skype to talk to a person on the same LAN.
But I do not want to transmit voice data to skype server outside of my LAN when I talk to a person on the same LAN.
Is there any free/opensource software that allows voice communication in the same LAN without relying on any external server.

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