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notherhack | 3 months ago

For NAT (Network Address Translation) or any other packet header modifications, you need to recalculate checksums manually

Why doesn’t checksum offload in the NIC take care of that?

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jcalvinowens|3 months ago

And I'm confused how they have to correct the TCP checksum but not the IPv4 header checksum...

shivanshvij|3 months ago

Oh no we absolutely have to also correct the IPv4 header checksum!