Not supported anymore?

I believe there were some big changes with raw socket supportin XP SP2. Here's a current link (5/28/2009)about raw sockets.http://msdn.microsoft.com/en-us/library/ms740548.aspxKerry Brown MS-MVP - Windows Desktop Experience

there known limit for sending data through raw sockets. But under Win7 RC-64 socket(AF_INET, SOCK_RAW, IPPROTO_IP) return INVALID_SOCKET (32 bit application).

You could try posting your question in one of the MSDN forums.http://social.msdn.microsoft.com/Forums/en-US/category/winnetdevKerry Brown MS-MVP - Windows Desktop Experience