Packet Analyzer :: Wireshark HD

https://www.netfort.com :: A packet analyzer (also known as a network analyzer, protocol analyzer or sniffer is computer software or computer hardware that can intercept and log traffic passing over a network Wireshark is a free and open-source packet analyzer. It is used for network troubleshooting, analysis, software and communications protocol development, and education. Microsoft also have a free offering called Microsoft Network Monitor