Getting IP from incoming packets

Greetings all,
I have various applications running on my computer such as, NetMeeting, Instant Messengers, Video Conferencing apps etc.

I was just wondering if there was a tool I could use to figure out IPs of the incoming packets, for example if someone sends me an instant message from AIM or whatever, I want to figure out the IP of this incoming connection.

I am on both Mac OS X (Unix) and PC environment...I am planning to use Snort, but that is too much of a configuration, I am looking for something simple.

Thanks for your help..
-Computurk
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CompuTurkAsked:
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MercantilumConnect With a Mentor Commented:
http://www.ethereal.com Simple and free
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gheistCommented:
www.sysinternals.com has some helpful applications for windows, better than netstat -na from default app set.
OSX may have sockstat or lsof at hand...
Ethereal, Mercantilum mentiones, is very powerful tool and will work with both (but it will not xref actual program to actual network traffic)
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CompuTurkAuthor Commented:
Thanks...
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