How is the checksum for the data field in a TCP packet computed, and how is that checksum incorporated into the checksum field in the TCP header? I see a number of checksum routines, and, frankly, I'm getting confused. Any help would be appreciated. Bill __________________________________________________ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/ - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org