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SubjectRe: IP: optimize as a router not host
> Yes, but the router will send out the bad (received) packet to the
> endpoint, the endpoint will complain and return an error through the
> router, the other endpoint will have to resend, the router will have
> to route it one more time,...

usually, packets are not bad.
so, on the average it is better(=for performance)
not to compute csum for
forwarded packets.

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