Wireshark is a network protocol analyzer. It lets you capture and interactively browse the traffic running on a computer network. It has a rich and powerful feature set and is world's most popular tool of its kind.
It runs on most computing platforms including Windows, OS X, Linux, and UNIX. Network professionals, security experts, developers, and educators around the world use it regularly. It is freely available as open source, and is released under the GNU General Public License version 2.
Wireshark 2.0 features a completely new user interface which should provide a smoother, faster user experience. The new interface should be familiar to current users of Wireshark but provide a faster workflow for many tasks. Version 2 also supports VXLAN.
Wireshark source code and installation packages are available from https://www.wireshark.org/download.html.