Wireshark 1.1.2
Wireshark is the world's foremost network protocol analyzer, and is the standard in many industries. It is the continuation of a project that started in 1998. Hundreds of developers around the world have contributed to it, and it is still under active development. Read/write many different capture file formats:
tcpdump (libpcap), Catapult DCT2000, Cisco Secure IDS iplog, Microsoft Network Monitor, NAI Sniffer (compressed and uncompressed), Sniffer Pro, and NetXray, Network Instruments Observer, Novell
LANalyzer, RADCOM WAN/LAN Analyzer, Shomiti/Finisar Surveyor, Tektronix K12xx, Visual Networks
Visual UpTime, and WildPackets EtherPeek/TokenPeek/AiroPeek.
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