From owner-freebsd-isp@FreeBSD.ORG Wed Jul 25 03:34:17 2007 Return-Path: Delivered-To: freebsd-isp@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id DE22516A417 for ; Wed, 25 Jul 2007 03:34:17 +0000 (UTC) (envelope-from janasamit@wlink.com.np) Received: from smtp5.wlink.com.np (smtp5.wlink.com.np [202.79.32.52]) by mx1.freebsd.org (Postfix) with SMTP id 7EA6D13C467 for ; Wed, 25 Jul 2007 03:34:13 +0000 (UTC) (envelope-from janasamit@wlink.com.np) Received: (qmail 72664 invoked from network); 25 Jul 2007 03:34:08 -0000 Received: from unknown (HELO smtp0.wlink.com.np) (202.79.32.96) by 0 with SMTP; 25 Jul 2007 03:34:08 -0000 Received: (qmail 95206 invoked by uid 98); 25 Jul 2007 03:34:08 -0000 Received: from 202.79.55.249 by smtp0.wlink.com.np (envelope-from , uid 1009) with qmail-scanner-1.25 (clamdscan: 0.90.3/3620. Clear:RC:1(202.79.55.249):. Processed in 0.039099 secs); 25 Jul 2007 03:34:08 -0000 X-Qmail-Scanner-Mail-From: janasamit@wlink.com.np via smtp0.wlink.com.np X-Qmail-Scanner: 1.25 (Clear:RC:1(202.79.55.249):. Processed in 0.039099 secs) Received: from 249.55.79.202.wireless.static.wlink.com.np (HELO [202.79.55.249]) by smtp0.wlink.com.np (qmail-smtpd) with SMTP; 25 Jul 2007 03:34:05 -0000 (Wed, 25 Jul 2007 09:19:05 +0545) Message-ID: <46A6C4AA.1010301@wlink.com.np> Date: Wed, 25 Jul 2007 09:19:02 +0545 From: Samit User-Agent: Thunderbird 2.0.0.4 (X11/20070706) MIME-Version: 1.0 To: Chuck Swiger References: <46A63AF2.40405@wlink.com.np> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Spam-Check-By: smtp0.wlink.com.np Spam: No ; 4.0 / 5.0 X-Spam-Status-WL: No, hits=4.0 required=5.0 Cc: freebsd-isp@freebsd.org Subject: Re: changing ttl size of forwarding packet X-BeenThere: freebsd-isp@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Internet Services Providers List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 25 Jul 2007 03:34:17 -0000 Chuck Swiger wrote: > On Jul 24, 2007, at 10:46 AM, Samit wrote: >> iptables can easily do it via mangle table. Is there any way using ipfw2 >> to change the ttl size of the forwarding packets? > > The size of the TTL field is fixed by the IP protocol to 1 byte; perhaps > you are looking for the IPFW transparent firewall option, which prevents > it from decrementing the TTL in order to make a "hidden" firewall...? > The other way round,want to lower the TTL as much as I want, as soon as it passes my firewall. Samit