TCP checksum offloading and non-zero checksums

[Vic Chester <vcsubscriptions () gmail com>]

I was under the impression that if TCP checksum offloading occurs, the
actual TCP checksum would be zero. Can anyone confirm?

The reason I ask is because I have a capture from a Centos 7 VM where
several packets (73) are reported as having incorrect TCP checksums. The
actual checksums are not zero however, and some of them when have replies
to them. If the checksum was really incorrect the ip stack of the receiver
should have discarded the packet.

Can anyone confirm or explain this behavior?

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