Wireshark-bugs: [Wireshark-bugs] [Bug 10687] Feature Request: Bad Checksum 0x00000000
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Thu, 29 Jan 2015 21:08:30 +0000

Comment # 16 on bug 10687 from 
(In reply to Michael Tüxen from comment #15)
> For TCP a zero checksum is not allowed (which is the same for UDP when enabled).

A TCP zero checksum is allowed; a TCP checksum of 0xFFFF is the problematic
value and is probably why Wireshark flags it as an Expert Info.  See
http://tools.ietf.org/html/rfc1624.

As for a UDP 0 checksum, refer to the UDP-relevant part of comment 7.

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