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Ethereal is a network protocol analyzer, or "packet sniffer",
that lets you capture and interactively browse the contents of
network frames. The goal of the project is to create
a commercial-quality packet analyzer for Unix, and the most
useful packet analyzer on any platform.

This version fixes potential security problems revealed
since the release of 0.9.3.
...

Changelog:
http://www.ethereal.com/ChangeLog