From owner-freebsd-security@FreeBSD.ORG Sat Nov 11 19:19:45 2006 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 99FF616A47E for ; Sat, 11 Nov 2006 19:19:45 +0000 (UTC) (envelope-from dan@obluda.cz) Received: from smtp1.kolej.mff.cuni.cz (smtp1.kolej.mff.cuni.cz [195.113.24.4]) by mx1.FreeBSD.org (Postfix) with ESMTP id 3DC0843D69 for ; Sat, 11 Nov 2006 19:19:37 +0000 (GMT) (envelope-from dan@obluda.cz) X-Envelope-From: dan@obluda.cz Received: from [10.20.0.26] (openvpn.ms.mff.cuni.cz [195.113.20.87]) by smtp1.kolej.mff.cuni.cz (8.13.6/8.13.6) with ESMTP id kABJJXvB000528 for ; Sat, 11 Nov 2006 20:19:35 +0100 (CET) (envelope-from dan@obluda.cz) Message-ID: <45562245.8070804@obluda.cz> Date: Sat, 11 Nov 2006 20:19:33 +0100 From: Dan Lukes User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.8.0.7) Gecko/20061025 SeaMonkey/1.0.5 MIME-Version: 1.0 To: freebsd-security@freebsd.org References: <216597.35069.qm@web30315.mail.mud.yahoo.com> In-Reply-To: <216597.35069.qm@web30315.mail.mud.yahoo.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: src/etc/rc.firewall simple ${fw_pass} tcp from any to any established 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: Sat, 11 Nov 2006 19:19:45 -0000 R. B. Riddick napsal/wrote, On 11/11/06 20:00: >> But I was scared, not undertstand what the established bit did, & >> how easily an attacker might fake something, etc. ... >> Should I still be worrying about established ? > Hmm... I personally use "check-states" and "keep-state", so that it is not Statefull rules can stop the sophisticated intruder, but are often more vulnerable to DoS attacks. Every method has pros and cons ... Dan -- Dan Lukes SISAL MFF UK AKA: dan@obluda.cz, dan@freebsd.cz,dan@kolej.mff.cuni.cz