iptables

# iptables -A INPUT -p tcp -m tcp --dport 80 -j ACCEPT

• Add the forwarding rule

# iptables -t nat -I PREROUTING -i ethExternal -p tcp --dport 4662 -j DNAT --to 192.168.0.11:4662

• Enable forwarding rule

# iptables -I FORWARD -i ethExternal -p tcp -d 192.168.0.11/32 --dport 4662 -j ACCEPT

• Add forwarding rule for internal hosts

# iptables -I FORWARD -i ethExternal -p tcp -s 192.168.0.11/32 --dport 4662 -j ACCEPT

• InformIT iptables