From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andreas Micklei <andreas.micklei@ivistar.de>
Subject: Re: Explicit source port mapping
Date: Wed, 1 Nov 2006 17:02:13 +0100
Message-ID: <200611011702.13270.andreas.micklei@ivistar.de>
References: <200611011624.21822.andreas.micklei@ivistar.de>
	<1162396092.4395.14.camel@localhost>
Mime-Version: 1.0
Content-Transfer-Encoding: quoted-printable
Return-path: <netfilter-bounces@lists.netfilter.org>
In-Reply-To: <1162396092.4395.14.camel@localhost>
Content-Disposition: inline
List-Id: <netfilter.vger.kernel.org>
List-Unsubscribe: <https://lists.netfilter.org/mailman/listinfo/netfilter>,
	<mailto:netfilter-request@lists.netfilter.org?subject=unsubscribe>
List-Archive: </pipermail/netfilter>
List-Post: <mailto:netfilter@lists.netfilter.org>
List-Help: <mailto:netfilter-request@lists.netfilter.org?subject=help>
List-Subscribe: <https://lists.netfilter.org/mailman/listinfo/netfilter>,
	<mailto:netfilter-request@lists.netfilter.org?subject=subscribe>
Sender: netfilter-bounces@lists.netfilter.org
Errors-To: netfilter-bounces@lists.netfilter.org
Content-Type: text/plain; charset="iso-8859-1"
To: Eric Leblond <eric@inl.fr>
Cc: netfilter@lists.netfilter.org

Am Mittwoch, 1. November 2006 16:48 schrieben Sie:
> I've never heard about such a feature.
>
> Just a simple question :
> 	Why do you want to do this ?

We are deploying netfilter in a research project for a customer. He wants t=
o=20
be able to distinguish natted hosts on the WAN side for traceability.

Just don't ask further. ;-)

So if no one has ever implemented that: Where do I start? Where is the=20
implicit source port mapping done (the one to avoid clashes) and can I hook=
=20
into this mechnism with a kernel module, or should I modify the existing=20
kernel code (which I have not looked at -  yet)?

> BR,
>
> Le mercredi 01 novembre 2006 =E0 16:24 +0100, Andreas Micklei a =E9crit :
> > Greetings,
> >
> > I have an unusual (maybe?) request. I have several private IPs
> > (192.168.x.x) behind a Linux gateway. All are NATed to the Internet. Now
> > I want to explicitely map each private IP to a fixed source port range =
on
> > the WAN interface of the gateway.
> >
> > Example:
> >
> > Connections from 192.168.42.1 are mapped to source ports 1024 - 1279
> > Connections from 192.168.42.2 are mapped to source ports 1280 - 1343
> > Connections from 192.168.42.3 are mapped to source ports 1344 - 1408
> > ...
> >
> > Quetions 1: Can netfilter do this for me?
> > Question 2: If not, would it be easy to implement, and can someone give=
 a
> > suggestion where I should start? - Or even better: Has someone already
> > implemented this?
> >
> > Sorry if my question sounds stupid. In the HOWTOs I could only find
> > implicit source port mapping. Also I did not find a search interface for
> > the mailinglist. So if this question is already answered, pointers are
> > appreciated.
> >
> > regards,
> > Andreas Micklei