Wireshark-bugs: [Wireshark-bugs] [Bug 1367] New: Invalid checksums with TCP offloading hardware.
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Sat, 10 Feb 2007 14:12:43 +0000 (GMT)
http://bugs.wireshark.org/bugzilla/show_bug.cgi?id=1367

           Summary: Invalid checksums with TCP offloading hardware.
           Product: Wireshark
           Version: 0.99.4
          Platform: PC
        OS/Version: Windows NT
            Status: NEW
          Severity: Minor
          Priority: Medium
         Component: Wireshark
        AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
        ReportedBy: john@xxxxxxxxxxxx


Build Information:
Version 0.99.4 (SVN Rev 19757)
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If a network interface uses TCP checksum offload the TCP dissector will flag
every outgoing packet as invalid. I think this is stupid, because outgoing
could be considered to not have checksums errors.

The TCP dissector should provide a feature for not computing the checksum of
segments which origins from the localhost.

I have a lot of packet captures were basically every other packet is considered
having a invalid checksum, and I don’t want to disable the check completely
since then any incoming packet which actually has an invalid checksum is
considered valid, which it's definitely not.


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