Wireshark

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.


Features
Wireshark has a rich feature set which includes the following:

* Hundreds of protocols are supported, with more being added all the time
* Live capture and offline analysis are supported
* Standard three-pane packet browser
* Multi-platform: Runs on Windows, Linux, OS X, Solaris, FreeBSD, NetBSD, and many others
* Captured network data can be browsed via a GUI, or via the TTY-mode TShark utility
* The most powerful display filters in the industry
* Rich VoIP analysis
* Read/write many different capture file formats: tcpdump (libpcap), Catapult DCT2000, Cisco Secure IDS iplog, Microsoft Network Monitor, Network General 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, WildPackets EtherPeek/TokenPeek/AiroPeek, and many others
* Capture files compressed with gzip can be decompressed on the fly
* Live data can be read from Ethernet, IEEE 802.11, PPP/HDLC, ATM, Bluetooth, USB, Token Ring, Frame Relay, FDDI, and others (depending on your platfrom)
* Decryption support for many protocols, including IPsec, ISAKMP, Kerberos, SNMPv3, SSL/TLS, WEP, and WPA/WPA2
* Coloring rules can be applied to the packet list, which eases analysis
* Output can be exported to XML, PostScript, CSV, or plain text