Wireshark-bugs: [Wireshark-bugs] [Bug 11857] TCP checksum marked as not all data available even
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Sat, 05 Dec 2015 18:12:00 +0000

changed bug 11857


What Removed Added
CC   joao.valverde@tecnico.ulisboa.pt

Comment # 5 on bug 11857 from 
(In reply to Pascal Quantin from comment #3)
> Note that to see the TCP packet, you need to explicitly deactivate the
> "reassemble fragmented IPv4 packets" that is activated by default.

This is not the case for me. I always see the TCP header.

Version 2.1.0-819-g7c8314a (Git Rev Unknown from unknown)

(In reply to boaz.brickner from comment #4)
> So basically any TCP over IPv4 packet with More Fragments bit on will have
> not all data available for the TCP checksum?
> Makes sense.
> In this case, the IPv4 packet's Total Length matches the payload so I guess
> Wireshark could theoretically calculate the checksum, but I understand why
> it didn't.

Total length is the IPv4 fragment size. So the TCP data is not all available
and the TCP checksum cannot be validated.

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