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grahamb's avatar
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grahamb
answered 2021-09-20 08:50:56 +0000

The checksum is only calculated if the preference ip.check_checksum is true, in the GUI this is set by the IP protocol preference "Validate the IPv4 checksum if possible".

If you add -o ip.check_checksum:true (that's the lower-case letter o, not zero) to your command line the preference will be set for that run of tshark.