Wireshark-users: [Wireshark-users] Checksum Display Filters
From: "Keith French" <[email protected]>
Date: Sun, 11 Feb 2007 20:20:00 -0000
In the IP, TCP or UDP headers is the "Checksum" field, which has two parts to it. For the IP checksum this is:-
Header checksum: 0xbbd5 [correct]
        [Good: True]
        [Bad : False]
with similar for the TCP and UDP checksums.
Is there any difference from a logical point of view when using a display filter to find packets with bad IP checksums between these two expressions:-
ip.checksum_bad == 1
ip.checksum_good == 0
As a checksum can only be correct or bad, surely both of these filters are the same?