Wireshark
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Description
Wireshark is an open-source multi-platform network protocol analyzer that allows users to examine data from a live network or from a capture file on disk. The tool can interactively browse capture data, delving down into just the level of packet detail needed. Wireshark has multiple features, including a rich display filter language and the ability to view the reconstructed stream of a TCP session. It also supports hundreds of protocols and media types.