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


From: Oleg Tyshev
Subject: [lwip-devel] [bug #27329] dupacks by unidirectional data transmit
Date: Mon, 31 Aug 2009 09:10:23 +0000
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2 GTB5

Follow-up Comment #2, bug #27329 (project lwip):

>Which one is running lwIP here, host1, host2 or both? 
Host2 has lwip and only receives data.

>Does host1 have to set the ACK flag on all the data packets being sent? I
suppose it may, though. 
Host1 sends of course packets with ACK flag, ackno in each packet acknoledges
e.g. SYN.

>Would unacked empty be enough? Probably not, as unacked might have been
moved to unsent in order to retransmit...
>Maybe only incrementing pcb->dupacks if unacked or unsent is not empty would
be better?
We need not only condition for incrementing,
but resetting too.
Something like that:
if (pcb->unacked || pcb->unsent) {
  ++pcb->dupacks;
}
else {
  pcb->dupacks = 0;
}


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