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notherhack
67 days ago
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An eBPF loophole: Using XDP for egress traffic
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?
jcalvinowens
67 days ago
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And I'm confused how they have to correct the TCP checksum but not the IPv4 header checksum...
shivanshvij
67 days ago
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Oh no we absolutely have to also correct the IPv4 header checksum!
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Why doesn’t checksum offload in the NIC take care of that?