NetWallah,
Have you seen WinPcap? I did a search for Cygwin & pcap and that's what I came up with. Unfortunately I do not have the required permissions at work to see if this would allow Net::Pcap or Net::RawIP to install, but I am betting you will have to mess with the Makefile anyway. By default it wants to link to -lpcap which I believe will need to change to -lwpcap. Sorry I couldn't be more help. I did check crazyinsomniac's repository and it doesn't look like one is available, though you could make a request.