From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?ISO-8859-1?Q?J=F6rg_Harmuth?= <harmuth@mnemon.de>
Subject: Re: MASQUERADING
Date: Thu, 21 Jul 2005 13:19:56 +0200
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References: <04EE7AD0450F7B498BA216312943A1A102B5A7CA@blrse201.ap.infineon.com>
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Chandra.Vempali@infineon.com schrieb:

> Suppose I masquerade ppp0 using
> iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE
> 
> And now all packets will have a src ip addr as 192.168.0.2 will be
> changed to that of ppp0 , for example say 10.10.10.1
> Now my question is, when the reply comes, their destination addr will be
> that of ppp0 i.e 10.10.10.1
> Who will reverse translate this 10.10.10.1 destination addr to actual
> 192.168.0.2 ?

This is the job of connection tracking, basically ipt_conntrack.

Have a nice time,

Joerg