> A socket in a synchronized state is required to enforce legal sequence
> numbers, is it not?
They are . :-)
Well, assuming that this is really illegal we could just add
missing LAST_ACK close to its relative CLOSING, CLOSE_WAIT
(where it was forgotten old days occasionally, I think).
It is minimal change and this is good.
But I look at problem at our side: if we receive such packet yet,
what should we make? Earlier we sent an ACK and dropped
bad segment or aborted connection. Now we just blackhole them
and the bug with missing case LAST_ACK just allowed to see the fact
that we changed behaviour, which is not good. :-)
Alexey
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