From owner-freebsd-security@FreeBSD.ORG Wed Apr 21 10:24:38 2004 Return-Path: Delivered-To: freebsd-security@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id E5F2F16A4CE; Wed, 21 Apr 2004 10:24:38 -0700 (PDT) Received: from smtp3b.sentex.ca (smtp3b.sentex.ca [205.211.164.50]) by mx1.FreeBSD.org (Postfix) with ESMTP id 7C3A843D53; Wed, 21 Apr 2004 10:24:38 -0700 (PDT) (envelope-from mike@sentex.net) Received: from avscan1.sentex.ca (avscan1.sentex.ca [199.212.134.11]) by smtp3b.sentex.ca (8.12.11/8.12.11) with ESMTP id i3LHObPE052164; Wed, 21 Apr 2004 13:24:37 -0400 (EDT) (envelope-from mike@sentex.net) Received: from lava.sentex.ca (pyroxene.sentex.ca [199.212.134.18]) by avscan1.sentex.ca (8.12.10/8.12.10) with ESMTP id i3LHOb3x026271; Wed, 21 Apr 2004 13:24:37 -0400 (EDT) (envelope-from mike@sentex.net) Received: from simian.sentex.net (simeon.sentex.ca [192.168.43.27]) by lava.sentex.ca (8.12.11/8.12.11) with ESMTP id i3LHOaAe044360; Wed, 21 Apr 2004 13:24:36 -0400 (EDT) (envelope-from mike@sentex.net) Message-Id: <6.0.3.0.0.20040421132605.0901bb40@209.112.4.2> X-Sender: mdtpop@209.112.4.2 (Unverified) X-Mailer: QUALCOMM Windows Eudora Version 6.0.3.0 Date: Wed, 21 Apr 2004 13:26:36 -0400 To: "Jacques A. Vidrine" From: Mike Tancsa In-Reply-To: <20040421165454.GB20049@lum.celabo.org> References: <6.0.3.0.0.20040420125557.06b10d48@209.112.4.2> <6.0.3.0.0.20040420144001.0723ab80@209.112.4.2> <200404201332.40827.dr@kyx.net> <20040421111003.GB19640@lum.celabo.org> <6.0.3.0.0.20040421121715.04547510@209.112.4.2> <20040421165454.GB20049@lum.celabo.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed X-Virus-Scanned: by amavisd-new cc: freebsd-security@FreeBSD.org Subject: Re: Other possible protection against RST/SYN attacks (was Re: TCP RST attack X-BeenThere: freebsd-security@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Security issues [members-only posting] List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Apr 2004 17:24:39 -0000 At 12:54 PM 21/04/2004, Jacques A. Vidrine wrote: >On Wed, Apr 21, 2004 at 12:30:40PM -0400, Mike Tancsa wrote: > > > > One other technique that might help with respect to this attack is what > > Cisco implemented, commonly known as the "TTL hack" > > > > http://www.nanog.org/mtg-0302/hack.html > >More commonly known as GTSM and RFC 3682. Are there any "bad things" that can happen by doing this ? ---Mike