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Brad
Selfish Heathen
 
Join Date: May 2004
Location: Zone of Pain
 
2005-05-15, 15:47

That's a bit trickier and may require listening to different packets. The level of difficulty depends much on the protocol and application being used.

As a starting place, check the tcpdump man pages. If you know the ports used by the protocol, the port <port>, src port <port>, and dst port <port> primitives may be useful for narrowing it down.

Alternatively, you might find the MacSniffer program useful if you are more comfortable with GUIs.

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