From owner-freebsd-security@FreeBSD.ORG Sun Jul 3 21:56:48 2005 Return-Path: X-Original-To: freebsd-security@freebsd.org 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 7C93516A41C for ; Sun, 3 Jul 2005 21:56:48 +0000 (GMT) (envelope-from jesper@ifconfig.se) Received: from mxfep01.bredband.com (mxfep01.bredband.com [195.54.107.70]) by mx1.FreeBSD.org (Postfix) with ESMTP id C263943D49 for ; Sun, 3 Jul 2005 21:56:47 +0000 (GMT) (envelope-from jesper@ifconfig.se) Received: from [213.112.198.211] ([213.112.198.211] [213.112.198.211]) by mxfep01.bredband.com with ESMTP id <20050703215645.LZDG24612.mxfep01.bredband.com@[213.112.198.211]>; Sun, 3 Jul 2005 23:56:45 +0200 Message-ID: <42C85F17.4050202@ifconfig.se> Date: Sun, 03 Jul 2005 23:56:39 +0200 From: Jesper Wallin User-Agent: Mozilla Thunderbird 1.0.2 (Windows/20050317) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Garrett Wollman References: <42C70FED.8080003@hackunite.net> <17095.18308.135102.939517@khavrinen.csail.mit.edu> In-Reply-To: <17095.18308.135102.939517@khavrinen.csail.mit.edu> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Mailman-Approved-At: Mon, 04 Jul 2005 14:07:57 +0000 Cc: freebsd-security@freebsd.org Subject: Re: packets with syn/fin vs pf_norm.c X-BeenThere: freebsd-security@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Security issues \[members-only posting\]" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 03 Jul 2005 21:56:48 -0000 Garrett Wollman wrote: >< said: > > > >>First of all, I know that not dropping SYN/FIN isn't really a big deal, it >>just makes no sense. But since it doesn't make any sense, I don't see >>the reason why not to discard them. >> >> > >Perhaps because you are under the erroneous impression that such >packets are nonsensical. > >-GAWollman > That might be the case yeah.. Yet, if I have TCP_DROP_SYNFIN in my kernel and sysctrl net.inet.tcp.drop_synfin set to 1, shouldn't it drop all SYN/FIN packets no matter how my firewall is configured? Best regards, Jesper Wallin