From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 24 Jan 2001 15:57:07 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 24 Jan 2001 15:56:57 -0500 Received: from Cantor.suse.de ([194.112.123.193]:34828 "HELO Cantor.suse.de") by vger.kernel.org with SMTP id ; Wed, 24 Jan 2001 15:56:41 -0500 Date: Wed, 24 Jan 2001 21:56:34 +0100 From: Andi Kleen To: kuznet@ms2.inr.ac.ru Cc: Manfred Spraul , linux-kernel@vger.kernel.org Subject: Re: Linux 2.2.16 through 2.2.18preX TCP hang bug triggered by rsync Message-ID: <20010124215634.A2992@gruyere.muc.suse.de> In-Reply-To: <3A6E02E6.B3261E1@colorfullife.com> <200101242003.XAA21040@ms2.inr.ac.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <200101242003.XAA21040@ms2.inr.ac.ru>; from kuznet@ms2.inr.ac.ru on Wed, Jan 24, 2001 at 11:03:34PM +0300 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jan 24, 2001 at 11:03:34PM +0300, kuznet@ms2.inr.ac.ru wrote: > Hello! > > > I read through the tcpdump, and it seems that Linux completely ignores > > packets with out-of-window sequence numbers: > > Yes, Linux is __very__ not right doing this. RFC requires to accept > ACK, URG and RST on any segment adjacent to window, even if window > is zero. It's mostly for security to make it more difficult to nuke connections without knowing the sequence number. Remember RFC is from a very different internet with much less DoS attacks. -Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/