Comment by notherhack
10 hours 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?
10 hours 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?
And I'm confused how they have to correct the TCP checksum but not the IPv4 header checksum...
Oh no we absolutely have to also correct the IPv4 header checksum!