From mboxrd@z Thu Jan  1 00:00:00 1970
From: Geert van der Ploeg <netfilter@geert.triple-it.nl>
Subject: Re: Problems With MASQ/ Kernel 2.4.29
Date: Sat, 12 Mar 2005 01:23:17 +0100
Message-ID: <42323675.8090007@geert.triple-it.nl>
References: <20050311180127.rcp5r70mjo0c4c4c@mail.col.gob.mx>
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To: "Ing. Rogelio Sevilla Fernandez" <sevilla@col.gob.mx>
Cc: netfilter@lists.netfilter.org

Ing. Rogelio Sevilla Fernandez wrote:
> I recently compiled kernel 2.4.29 with all netfilter options as modules.
> 
> All start ok, but when i set the MASQUERADE jump target on POSTROUTING
> i got:
> iptables -t nat -I PREROUTING -o eth0 -j MASQUERADE
> iptables: target problems.

when using PREROUTING rules, you should specify the incoming interface,
not the outgoing.
Or, said the other way around: when using an outgoing interface, you
should specify POSTROUTING rules.

So, because you try to masquerade, what you really want is:
iptables -t nat -I POSTROUTING -o eth0 -j MASQUERADE

See section 5 in the NAT-howto for iptables.


Hope this helps.


Regards,

Geert van der Ploeg