From mboxrd@z Thu Jan  1 00:00:00 1970
From: Bastian Bittorf <bittorf@bluebottle.com>
Subject: Re: About using -i with MASQUERADE
Date: Fri, 22 Jan 2016 15:07:27 +0100
Message-ID: <20160122140727.GC27441@medion.lan>
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To: Fabio Pedretti <fabio.pedretti@unibs.it>
Cc: netfilter@vger.kernel.org

* Fabio Pedretti <fabio.pedretti@unibs.it> [22.01.2016 13:49]:
> Hi, I would like to do the following:
> -t nat -A POSTROUTING -i eth3 -j MASQUERADE

this explains, why -i is not possible here:
https://en.wikipedia.org/wiki/Netfilter#/media/File:Netfilter-packet-flow.svg

bye, bastian