Easy Sniffer

Easy sniffer is a network capture application that works with native windows API. It works only with windows 2000 (pro and server) because the ability to capture raw packets was removed from windows XP due to some obscure security issue. Possibly it works with server 2003.

Download: Easy Sniffer (w2k only)
The archive contains one executable that will work without installing.
Please do not contact me to report that it doesn't work on XP because it simply doesn't and never will!

Alternatives that work with windows XP and 9x:
Wireshark