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[Dan Mick]

> Once again I will plug my favourite network debugging tool: Ethereal, a
> fantastic GUI packet-tracing tool.  

...and of course there are many other packet-tracing tools if you
don't happen to have Ethereal that accomplish the same thing:
etherfind, tcpdump, snoop just to name a few.

One of the many many reasons that setting up networking on
Unix is so much more fun than setting it up on other OSes.