From owner-freebsd-ipfw  Wed Mar 27 15:38:15 2002
Delivered-To: freebsd-ipfw@freebsd.org
Received: from rwcrmhc54.attbi.com (rwcrmhc54.attbi.com [216.148.227.87])
	by hub.freebsd.org (Postfix) with ESMTP id A3B2137B41D
	for <freebsd-ipfw@FreeBSD.ORG>; Wed, 27 Mar 2002 15:38:02 -0800 (PST)
Received: from blossom.cjclark.org ([12.234.91.48]) by rwcrmhc54.attbi.com
          (InterMail vM.4.01.03.27 201-229-121-127-20010626) with ESMTP
          id <20020327233802.DILS1214.rwcrmhc54.attbi.com@blossom.cjclark.org>;
          Wed, 27 Mar 2002 23:38:02 +0000
Received: (from cjc@localhost)
	by blossom.cjclark.org (8.11.6/8.11.6) id g2RNc1D94899;
	Wed, 27 Mar 2002 15:38:01 -0800 (PST)
	(envelope-from cjc)
Date: Wed, 27 Mar 2002 15:38:01 -0800
From: "Crist J. Clark" <cjc@FreeBSD.ORG>
To: Szabados Jozsef <szabadosjozsef@freemail.hu>
Cc: freebsd-ipfw@FreeBSD.ORG
Subject: Re: transparent proxying
Message-ID: <20020327153801.T89885@blossom.cjclark.org>
References: <freemail.20020227123005.5030@fm1.freemail.hu> <freemail.20020227133246.60118@fm2.freemail.hu>
Mime-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
User-Agent: Mutt/1.2.5i
In-Reply-To: <freemail.20020227133246.60118@fm2.freemail.hu>; from szabadosjozsef@freemail.hu on Wed, Mar 27, 2002 at 01:32:46PM +0100
X-URL: http://people.freebsd.org/~cjc/
Sender: owner-freebsd-ipfw@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-ipfw.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo@FreeBSD.ORG?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo@FreeBSD.ORG?subject=subscribe%20freebsd-ipfw>
List-Unsubscribe: <mailto:majordomo@FreeBSD.ORG?subject=unsubscribe%20freebsd-ipfw>
X-Loop: FreeBSD.ORG

On Wed, Mar 27, 2002 at 01:32:46PM +0100, Szabados Jozsef wrote:
> Sorry, I forgot the subject.
> 
> Szabados Jozsef <szabadosjozsef@freemail.hu> írta:
> 
> > Hi!
> > 
> > I would need some starting info about transparent proxying.
> > 
> > So, first I forward the packet, on port xx to 127.0.0.1:xxxx
> > the proxy get the packet, and it will see the destination ip
> > 127.0.0.1, isn't it?

It will be _delivered_ to 127.0.0.1

> > So how can I find out the original
> > destination
> > ip address of the packet?

Read it out of the packet. 'fwd' makes no modifications to the
packet.
-- 
Crist J. Clark                     |     cjclark@alum.mit.edu
                                   |     cjclark@jhu.edu
http://people.freebsd.org/~cjc/    |     cjc@freebsd.org

To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-ipfw" in the body of the message