Wireshark-bugs: [Wireshark-bugs] [Bug 1136] TCP checksum validation

Date: Sat, 31 Mar 2007 08:58:21 +0000 (GMT)
http://bugs.wireshark.org/bugzilla/show_bug.cgi?id=1136





------- Comment #5 from sake@xxxxxxxxxx  2007-03-31 08:58 GMT -------
I calculated the tcp-checksum of the attached packet by hand. It should indeed
have been 0x0000 instead of 0xffff. The problem is most likely be caused by an
incremental update of the checksum done with a wrong algorythm. See RFC 1624:
"Computation of the Internet Checksum via Incremental update"
(http://rfc.net/rfc1624.html).

I will have a look into the tcp-checksum-calculation-code of wireshark to see
why wireshark still thinks this 0xffff is a valid checksum.


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