Gents - I apologize...my initial question was too vague... I'm using RedHat 7.0, and I'm looking at the tcp_output (v. 1.108.2.6) and tcp_input (v. 1.164.2.15) files for their checksum handling. For normal data (connection in ESTABLISHED state), which subroutines actually compute the checksum for the data field, and where is that checksum then incorporated into the TCP header? Sorry for the initial confusion... Cheers, Bill --- Mal Hacker <malhacker@yahoo.com> wrote: > hello glynn, > again a line to add to my previous remark... > sorry glynn, you are right. Actually the place where > i > had computed the checksum in my progs , i was not > sending any data so i looked at that code and sent > the > code....the kernel code clears everything thanks.... > malhacker > __________________________________________________ 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