[e2e] Some questions about TCP.
perfgeek at mac.com
Tue Nov 24 13:55:29 PST 2009
On Nov 24, 2009, at 10:01 AM, David P. Reed wrote:
> On 11/24/2009 11:41 AM, rick jones wrote:
>> Since reordering is presumed rare, when three of these duplicate
>> ACKs have been received, we can presume that three segments beyond
>> the possibly lost segment were received and be statistically
>> certain that segment was indeed lost.
> I may have gotten confused by the way this conversation has
> wandered, but there is no statistical certainty of loss here.
> There are lots of ways that three duplicate ACKs can be sent, and
> then received. Every time the receiver receives a duplicate of a
> previously accepted segment it will transmit another ACK with the
> same content - there need be no "hole" and no segments to the
> "right" of the hole.
I shouldn't have invoked statistics when recounting my understanding
of the reasoning behind the fast retransmit heuristic :)
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