From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pascal Hambourg <pascal.mail@plouf.fr.eu.org>
Subject: Re: Help with IPtables and NAT
Date: Sat, 22 Jul 2006 12:29:54 +0200
Message-ID: <44C1FE22.70209@plouf.fr.eu.org>
References: <44C16109.20704@jemconsult.biz> <44C1E06F.1080803@free-4ever.net>
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Guillaume a =E9crit :
>=20
> I think you 2 problems in your rules:
>  - The chains in NAT table must not be set to drop. NO filtering in nat=
=20
> table.
>  - You forgot to add the rules to autorise traffic coming from eth0:0 t=
o=20
> your internal host. After a DNAT rule, you need to explicitely autorise=
=20
> the corresponding traffic.
> Ab i think, I've don't read any rule related to that.
>=20
> For example, you set this rule:
> iptables -t nat -A PREROUTING -d 172.10.10.2 -p tcp --dport 80 -j DNAT=20
> --to-dest 192.168.0.2
> You must set this rule:
> iptables -t filter -A FORWARD -i eth0:0 -p tcp -d 192.168.0.2 --dport 8=
0=20
> -j ACCEPT
> And the same for all incoming traffics.

This is correct except for one detail : the interface eth0:0 does not=20
exist. It is only an alias and is not used by either the routing nor=20
iptables. You muse use the real interface name, eth0.