No need fr CygWin - Pcap runs natively under Win32. There are a few minor quirks to work around - I have some packet capture/analysis perl code that has been working well - (Caught a lot of virii in our network). /msg me with your e-mail, and I'll be glad to send it.

FYI- The NIC does not need to be passive.

"When you are faced with a dilemma, might as well make dilemmanade. "