Date: Mon, 1 Jul 2002 23:51:42 -0500 (CDT) From: Mike Silbersack <silby@silby.com> To: pavel@alum.mit.edu Cc: net@FreeBSD.ORG Subject: Re: questions about TCP RST validity Message-ID: <20020701234858.G87544-100000@patrocles.silby.com> In-Reply-To: <200207020353.g623rUR62985@scout.networkphysics.com>
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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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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