Checksum Offload on the NIC(s) can complicate things. First, if you are tracing
on the sender, the tracepoint is before the NIC has computed the full checksum.
IIRC only a partial checksum is passed-down to the NIC when CKO is in use.
So, making certain your trace is from the "wire" or the receiver rather than the
sender would be a good thing, and trying again with CKO disabled on the
interface(s) (via ethtool) might be something worth looking at. Ultimately,
doing the partial checksum modificiations in a CKO-friendly manner might be a
good thing.
rick jones
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