====== Iptables_forward ======

Problem:
<br>
Computer A (Internal Win2k)-------: IP: 10.0.0.1<br>
Computer B (Linux Box)------------: IP: 136.201.105.2<br>
Computer C (General Internet pc)--: IP: 136.206.111.3<br>
<br>
Computer B has 1 network card. It is on the same LAN as Computer A and has external Internet Access.<br>
Computer B can access **both** Computer A and Computer C.<br>
<br>
-------------------------------------------------------------------------------<br>
There is a Webserver on Computer A -> 10.0.0.1:80<br>
Computer C (general internet) cannot access the above Webserver on Computer A.<br>
<br>
We want to use Computer B to **forward** all traffic from Computer C to Computer A.<br>
--------------------------------------------------------------------------------
iptables firewall can be used to forward such connections.<br>
<br>
The Setup:<br>

Going from Scratch:
 iptables -F
 # Flush rules from iptables
 <br>
 iptables -t nat -F
 # Flush rules from nat table in iptables
 <br>
 iptables -t nat -A PREROUTING -p tcp -d 136.201.105.2 --dport 80 -j DNAT --to 10.0.0.1:80
 iptables -t nat -A POSTROUTING -d 10.0.0.1 -j MASQUERADE

If Computer C types http://136.201.105.2 into their Internet, they will see the Webserver on Computer A (10.0.0.1).

This Works. Will get around to perhaps explaining it later.

Look at the complete [[Iptables_Firewall]]

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Further Information at:<br>
http://documents.made-it.com/Debian_Internet_Server/Debian_Internet_Server-13.html<br>
http://lists.debian.org/debian-user/2002/08/msg00112.html