Joe Clarke Mon, 05/14/2007 - 14:06
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The Ethereal sniffer program is open source, and very functional. However, due to certain circumstances, the project was renamed to Wireshark. The latest version of Wireshark is therefore your best choice for a free, functional sniffer. See http://www.wireshark.org for more details.

Joe Clarke Mon, 05/14/2007 - 14:18
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Ethereal is free, it's just out-of-date. Wireshark is where all the new development is happening.

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