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With packet retransmissions and out-of-order packet delivery, wouldn't there be a risk that the client software at uid=10 sees a clean shutdown and disconnects, but uid=20 instantly binds with the same ports and steals a bunch of delayed packets?


That happens with UDP already and is another reason everything ought to be encrypted with session keys.

But the normal TCP solution of the OS holding released ports in TIME_WAIT for a couple of minutes still works as ever.




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