In exemplul urmator, avem o retea interna 192.168.0.0/24. Routerul are interfata externa eth0, cu IP: xxx.xxx.xxx.xxx. Vom face port forwarding de la xxx.xxx.xxx.xxx:8888 la 192.168.0.2:80, pe care ruleaza un server de web:
/sbin/iptables -t nat -A PREROUTING -p tcp -i eth0 -d xxx.xxx.xxx.xxx --dport 8888 -j DNAT --to 192.168.0.2:80 /sbin/iptables -A FORWARD -p tcp -i eth0 -d 192.168.0.2 --dport 80 -j ACCEPT
