Wireshark is the world's most popular network protocol analyzer. It is used for troubleshooting, analysis, development and education.

The following bugs have been fixed:

The following features are new (or have been significantly updated) since version 1.6: Wireshark supports capturing from multiple interfaces at once. Wireshark, TShark, and their associated utilities now save files using the pcap-ng file format by default. (Your copy of Wireshark might still use the pcap file format if pcap-ng is disabled in your preferences.) Decryption key management for IEEE 802.11, IPsec, and ISAKMP is now easier. OID resolution is now supported on 64-bit Windows. TCP fast retransmissions are now indicated as an expert info note, rather than a warning, just as TCP retransmissions are. TCP window updates are no longer colorized as "Bad TCP".

Wireshark source code and installation packages are available from http://www.wireshark.org/download.html.

Most Linux and Unix vendors supply their own Wireshark packages. You can usually install or upgrade Wireshark using the package management system specific to that platform. A list of third-party packages can be found on the download page on the Wireshark web site.

Wireshark and TShark look in several different locations for preference files, plugins, SNMP MIBS, and RADIUS dictionaries. These locations vary from platform to platform. You can use About→Folders to find the default locations on your system.

Wireshark might make your system disassociate from a wireless network on OS X 10.4. (Bug 1315) Dumpcap might not quit if Wireshark or TShark crashes. (Bug 1419) The BER dissector might infinitely loop. (Bug 1516) Capture filters aren't applied when capturing from named pipes. (Bug 1814) Filtering tshark captures with display filters (-R) no longer works. (Bug 2234) The 64-bit Windows installer does not ship with libsmi. (Win64 development page) Application crash when changing real-time option. (Bug 4035) Hex pane display issue after startup. (Bug 4056) Packet list rows are oversized. (Bug 4357) Summary pane selected frame highlighting not maintained. (Bug 4445) Wireshark and TShark will display incorrect delta times in some cases. (Bug 4985 and bug 5580) Character echo pauses in Capture Filter field in Capture Options. (Bug 5356)

Community support is available on Wireshark's Q&A site and on the wireshark-users mailing list. Subscription information and archives for all of Wireshark's mailing lists can be found on the web site. Training is available from Wireshark University.

A complete FAQ is available on the Wireshark web site.