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

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