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

or

ip.checksum_good == 0

As a checksum can only be correct or bad, surely both of these filters are the 
same?



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