From mboxrd@z Thu Jan  1 00:00:00 1970
From: Francesco Ciocchetti <primero@fastwebnet.it>
Subject: Re: Doubt about forwarding. Please, Help me!
Date: Thu, 14 Jul 2005 20:46:51 +0200
Message-ID: <42D6B31B.9010902@fastwebnet.it>
References: <20050714184051.CE18E6F027@ws1-5.us4.outblaze.com>
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To: Morales Carlos <cmmorales@mail.com>
Cc: netfilter@lists.netfilter.org

Morales Carlos wrote:

>Hello. I have a firewall blocking all the traffic from the Internet to my local network, but I need to let an external host (extHOST) to access the port 8888 (for example) of an internal host (intHOST). Is this correct? The external lan adapter is eth1.
>
> /sbin/iptables -t nat -A PORTFW -p tcp -i eth1 -s extHOST --dport 8888 -j DNAT --to-destination intHOST:8888
>
>Thaks, please email me to cmmorales@mail.com 
>Carlos
>
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>
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>  
>
As long as in PREROUTING Chain of nat table there is a JUMP to PORTFW it
is ok.

What you need is to have a DNAT in nat table PREROUTING chain , and a
rule to allow traffic to the DNATTED dst port 8888 in the filter table
FORWARD chain.

Bye
Francesco