Step 1: Setup a linux gateway server with public ip address.
Help: http://reddragon-linux.blogspot.com/2011/05/linux-internet-gateway-server-setup.html
Step 2: Find the service type which need the port forwading.
Eg: HTTP ( Port 80, TCP).
Public ip address : XXX.XXX.XXX.XXX
Local ip address : 192.168.1.2
/sbin/iptables -t nat -A PREROUTING -p tcp -i eth0 -d XXX.XXX.XXX.XXX --dport 80 -j DNAT --to 192.168.1.2:80
/sbin/iptables -A FORWARD -p tcp -i eth0 -d 192.168.1.2 --dport 80 -j ACCEPT
Help: http://reddragon-linux.blogspot.com/2011/05/linux-internet-gateway-server-setup.html
Step 2: Find the service type which need the port forwading.
Eg: HTTP ( Port 80, TCP).
Public ip address : XXX.XXX.XXX.XXX
Local ip address : 192.168.1.2
/sbin/iptables -t nat -A PREROUTING -p tcp -i eth0 -d XXX.XXX.XXX.XXX --dport 80 -j DNAT --to 192.168.1.2:80
/sbin/iptables -A FORWARD -p tcp -i eth0 -d 192.168.1.2 --dport 80 -j ACCEPT
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