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  • One question about TCP FACK

    From jan.wang1989@gmail.com@21:1/5 to All on Thu May 4 07:15:25 2017
    Hi all,
    This may be simple but I just begin learning TCP deeply.
    I am reading TCP FACK paper MM96(http://conferences.sigcomm.org/sigcomm/1996/papers/mathis.pdf)
    and I don't quite understand below statement:

    if the sender receives an ACK which advances snd.fack beyond the value of snd.nxt at the time a segment was retransmitted (and that retransmitted segment is otherwise unaccounted for), the sender knows that segment which was retransmitted has been lost.

    could someone give more explanation or examples, why the sender can determine the retransmitted segment has been lost?

    thanks,
    Jan

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