From mboxrd@z Thu Jan  1 00:00:00 1970
From: prabha <prabha@multitech.co.in>
Subject: Re: local connections getting natted
Date: Wed, 04 Feb 2004 11:24:50 +0530
Sender: netfilter-admin@lists.netfilter.org
Message-ID: <4020892A.6FB4D142@multitech.co.in>
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Return-path: <netfilter-admin@lists.netfilter.org>
Errors-To: netfilter-admin@lists.netfilter.org
List-Help: <mailto:netfilter-request@lists.netfilter.org?subject=help>
List-Post: <mailto:netfilter@lists.netfilter.org>
List-Subscribe: <https://lists.netfilter.org/mailman/listinfo/netfilter>,
	<mailto:netfilter-request@lists.netfilter.org?subject=subscribe>
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: <https://lists.netfilter.org/pipermail/netfilter/>
Content-Type: text/plain; charset="us-ascii"
To: clister <clister@uah.es>, "netfilter@lists.netfilter.org" <netfilter@lists.netfilter.org>

Hi

>     185K 8942K SNAT       all  --  *      eth0    0.0.0.0/0
0.0.0.0/0
to:1.2.3.4

This rule will change the source address of all the packet going out of
the eth0 interface. (Irrespective of whether they are local packets or
forwarded packets)

>I thought this happened only if you create such rule on NAT::ouput so
local
>connections get natted prior to go out of the box.

The NAT:OUTPUT chain will do a NAT for local packets (ie) packets
generated by the local machine.

>Should i change this to:
>-t nat -A POSTROUTING -i eth1 -o eth0 -j SNAT --to-destination:1.2.3.4
to
>avoid local packets getting natted?

Yes, this should work.

>and last question:
>All packets leaving routing code (local, forwarded) pass througth
>POSTROUTING chain at nat table or only forwarded packets?

Yes, all the packets will pass through the POSTROUTING chain.

Prabha