Wireshark allows the user to put network interface controllers that support promiscuous mode into that mode, in order to see all traffic visible on that interface, not just traffic addressed to one of the interface's configured addresses and broadcast/multicast traffic. Wireshark is very similar to tcpdump, but has a graphical front-end, plus some integrated sorting and filtering options. Wireshark, and the other programs distributed with it such as TShark, are free software, released under the terms of the GNU General Public License. There is also a terminal-based (non-GUI) version called TShark.
Wireshark is cross-platform, using the GTK+ widget toolkit to implement its user interface, and using pcap to capture packets it runs on various Unix-like operating systems including Linux, OS X, BSD, and Solaris, and on Microsoft Windows. Originally named Ethereal, in May 2006 the project was renamed Wireshark due to trademark issues.
It is used for network troubleshooting, analysis, software and communications protocol development, and education. Wireshark is a free and open-source packet analyzer.
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