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Buying Guide: Wireshark 1.2.6
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The home screen of Wireshark has a banner citing it as "The World's Most Popular Network Protocol Analyzer." While I can't quantify that claim, there is no doubt that Wireshark is a widely-used tool for troubleshooting network problems. I can tell you, it's not only free, it's does so much more than most of the competition.
Read the full review of Wireshark 1.2.6.