Wireshark 1.9.0
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Platform: Linux Debian package (64-bit)
Compiled from source codes (Development Release 1.9.0).

Working very well with Ubuntu 12.04 LTS (64-bit)


A tool to analyse and troubleshoot your network

Wireshark has all of the standard features  you would expect in a protocol analyzer, and several features not seen in any other product.

Wireshark is used by network professionals around the world for troubleshooting, analysis, software and protocol development, and education.


Product's homepage: https://www.wireshark.org/

Here are some key features of "Wireshark":

· Data can be captured "off the wire" from a live network connection, or read from a capture file.
· Ethereal can read capture files from tcpdump (libpcap).
· Captured network data can be browsed via a GUI, or via the TTY-mode "tethereal" program.
· Capture files can be programmatically edited or converted via command-line switches to the "editcap" program.
· Output can be saved or printed as plain text or PostScript.
· Data display can be refined using a display filter.
· Display filters can also be used to selectively highlight and color packet summary information.
· All or part of each captured network trace can be saved to disk.


Read more about Wireshark features from their official web page: 
https://www.wireshark.org/