From mboxrd@z Thu Jan  1 00:00:00 1970
From: Martijn Lievaart <m@rtij.nl>
Subject: Re: Port forwarding question
Date: Thu, 21 Sep 2006 22:23:17 +0200
Message-ID: <4512F4B5.6050206@rtij.nl>
References: <200609211555.39634.dyioulos@firstbhph.com>
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To: Dimitri Yioulos <dyioulos@firstbhph.com>
Cc: netfilter@lists.netfilter.org

Dimitri Yioulos wrote:

>Hi, folks.
>
>Noob, question:
>
>I want to allow a vendor to access a piece of equipment on our LAN  
>(192.168.100.46) through port 4000 from outside via a server in our 
>DMZ (www.xxx.yyy.zzz).  While I should know how to do this, I'm not 
>100% sure.  Can someone help?
>  
>

In PREROUTING do a DNAT rule, in FORWARD allow traffic to 192.168.100.46.

>Oh, and separately, how would I allow that access only through the 
>vendor's ip address, if that were the way I decided to go?
>  
>

Add -s $VENDOR_IP to both rules.

HTH,
M4