[lwip-devel] [bug #27329] dupacks by unidirectional data transmit

[Oleg Tyshev]

URL:
  <http://savannah.nongnu.org/bugs/?27329>

                 Summary: dupacks by unidirectional data transmit
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: olegreen
            Submitted on: Thu 27 Aug 2009 09:47:39 AM GMT
                Category: TCP
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 
            lwIP version: CVS Head

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Details:

If data are being sent unidirectional from host1 to host2,
host2 receives always duplicated acks.

In this case variable pcb->dupacks with each packet will be incremented.
If host2 send only one packet, after receiving next ACK it goes immediately
in fast retransmit.

I think dupacks variable should be reseted if unacked and unsent queues are
empty.





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