Date: Fri, 21 Nov 1997 11:02:58 +0100 (MET) From: Guido van Rooij <guido@gvr.org> To: ji@research.att.com Cc: jkh@FreeBSD.ORG, freebsd-bugs@FreeBSD.ORG, security-officer@FreeBSD.ORG Subject: Re: kern/5103 Message-ID: <199711211002.LAA23097@gvr.gvr.org> In-Reply-To: <199711210551.AAA03044@bual.research.att.com> from John Ioannidis at "Nov 21, 97 00:51:19 am"
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John Ioannidis wrote: > This is an old bug, BTW; it's the simultaneous-open bug. Look in > Stevens (TCP/IP Illustrated) Volume 1, chapter 18. I thought it had > been fixed for 4.4BSD; BSDI 2.0 didn't have the problem. How did it > re-emerge? > I am not sure it is the same. What happens here is that the TCP stack gets a SYN in the TCPS_LISTEN state and sends back a SYN-ACK. and goes to SYN_RCVD. In the simultaneous open, a SYN is sent and pone goes to SYN_SENT and receives a SYN in that state. Garrett told me that when you send this packet from the host you are receiving it from, it does no harm. This would more or less support my idea that it is something different. -Guido
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