Date: Fri, 31 Jul 2009 23:41:42 +0200 From: =?ISO-8859-1?Q?Michael_T=FCxen?= <Michael.Tuexen@lurchi.franken.de> To: <Hartmut.Brandt@dlr.de> <Hartmut.Brandt@dlr.de> Cc: net@freebsd.org Subject: Re: TCP RST question Message-ID: <FBF62984-6610-43E9-A3A9-6B57A1CFE341@lurchi.franken.de> In-Reply-To: <E086A96846579E4F932C168218DB1E550243BA@exbe5.intra.dlr.de> References: <E086A96846579E4F932C168218DB1E550243BA@exbe5.intra.dlr.de>
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On Jul 31, 2009, at 3:57 PM, <Hartmut.Brandt@dlr.de> <Hartmut.Brandt@dlr.de > wrote: > Hi all, > > I'm looking at our TCP stack and found a change that was introduced > with > the syncache. The original BSD code did send an RST segment when the > connection timed out in SYN-RECEIVED. The TCP would retransmit the > SYN+ACK several times and then give up and RST the peer. > > With syncache, however, our TCP doesn't send the RST anymore. It just > silently discards local state. > > So the question is whether TCP is supposed to RST or not. Looking at > RFC793 I found nothing useful. It talks about sending RSTs as response > to incoming segments and it looks like TCP is never supposed to give > up > retransmitting. The state diagram has no line from SYN-RECEIVED to > CLOSED. Stevens, on the other hand, has this line and it is labeled > 'send: RST'. > > So the questions are: > > - is TCP supposed to send an RST when it times out in SYN-RECEIVED? > - why was this changed (I suppose it is just one of the regressions > introduced with the syn-cache). > > harti > > NB: does anybody know a good mailing list where this kind of questions > can be discussed? tsvwg@ietf.org tcpm@ietf.org Best reagrds Michael > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" >
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