[lwip-devel] [bug #28106] duplicate acknowledge for fast retransmit could have not null length

[Oleg Tyshev]

Follow-up Comment #5, bug #28106 (project lwip):

Yes, it looks like in Linux data packet not considered to be dupack.


tcp_send_empty_ack patch

* the whole segment is < rcv_nxt
* if the incoming segment is out-of-sequence
* The incoming segment is not withing the window
* Segments with length 0 out of the window

Yes, first case with old segment could stay with send_ach_now()
I don't know about 4th:
each 0 segment will be answered with 0 segment immediately,
in case erroneous seqno ping-pong will last endless?



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