Wireshark is a GTK+-based network protocol analyzer that lets you capture and interactively browse the contents of network frames. The goal of the project is to create a commercial-quality analyzer for Unix and Win32 and to give Wireshark features that are missing from closed-source sniffers.
You can download it from the following link: https://packetstormsecurity.com/files/download/82321/wireshark-1.2.3.tar.bz2
Source: https://packetstormsecurity.com/files/82321/Wireshark-Analyzer-1.2.3.html