From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jason Opperisano <opie@817west.com>
Subject: Re: DNAT
Date: Tue, 26 Oct 2004 08:42:14 -0400
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References: <20041026102023.GA7941@tranquility.scriptkitchen.com>
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On Tue, 2004-10-26 at 06:20, Payal Rathod wrote:
> Hi,
> I want to access my internal machine from outside. But I am unable to do 
> so. I tried,
> # iptables -t nat -I PREROUTING -d <my_ext_ip> -p tcp --dport
> 8081 -j DNAT --to-destination 192.168.0.16:80

that looks ok...keep in mind you'll need to go to: 
http://<my_ext_ip>:8081 to hit the server from the outside

> # iptables -I INPUT -p tcp --dport 8081 -j ACCEPT

nope--try:

  iptables -A FORWARD -p tcp -d 192.168.0.16 --dport 80 -j ACCEPT

once PREROUTING is traversed--the packet is forever changed from the
perspective of all remaining chains.

> # iptables -I FORWARD -s 192.168.0.16 -j ACCEPT

i guess the point of that is to allow the replies back?  ok, i guess...

-j

-- 
Jason Opperisano <opie@817west.com>