Free Download Wireshark 1.99.5 (64-bit) Beta

Wireshark is the world's foremost network protocol analyzer, and is
the de facto standard across many industries and educational
institutions.

Deep inspection of hundreds of protocols, with more being added all the time
Live capture and offline analysis
Standard three-pane packet browser
Multi-platform: Runs on Windows, Linux, OS X, Solaris, FreeBSD, NetBSD, and many others
Captured