> > So that the same logic applies to TCP packets as well. Currently, we
> > can send a TCP packet with a checksum of 0, which is legal. Of possible
> > interest is that Linux doesn't do this; they alwyas send a non-zero
> > checksum in the TCP case, if a checksum was computed.
> >
> Hmm, but why would we do this for TCP? This violates RFC 793.
> AFAIK, only UDP checksums are special.
0x0000 and 0xFFFF are both 16-bit 1's complement representations of
zero, so you could send either and still have the remote TCP validate
the checksum.
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