On Mon, 1 Jul 2002, Tom Pavel wrote:

> Here is a trace to illustrate:
>
> 09:05:35.956066 AA.80 > BB.61390: . 3568529946:3568531406(1460) ack 2597111261 win 
>4380 (DF)
> 09:05:36.961787 AA.80 > BB.61390: . 3568529946:3568531406(1460) ack 2597111261 win 
>4380 (DF)
> 09:05:38.973207 AA.80 > BB.61390: . 3568529946:3568531406(1460) ack 2597111261 win 
>4380 (DF)

Is this a real trace?  It looks highly irregular to me.  I don't see why
BB isn't RSTing each packet, and AA looks to be retransmitting way too
quickly.

> In any event, though, it seems to me relatively harmless to have AA
> accept seqnums "slightly" to the left of its current advertised window
> (say last_ack_sent - rcv_wnd).  This would save a bunch of needless
> retransmits and it would clean up the control block much sooner than
> letting AA timeout on retransmitting.
>
> What collective wisdom do folks have about this?
>
>
> Tom Pavel

I'm not sure doubling the "RST window" is a good idea.  With window sizes
increasing as they are, that could become a significant issue as time goes
on.  How about one MSS worth of window or something similar?

Mike "Silby" Silbersack


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