Simple Port Forwarding using IPTABLES

# IP Forwarding
echo "1" > /proc/sys/net/ipv4/ip_forward

# Policy
/sbin/iptables -P INPUT ACCEPT
/sbin/iptables -P OUTPUT ACCEPT
/sbin/iptables -P FORWARD ACCEPT

# IP Masquerade
/sbin/iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

# Forward
/sbin/iptables -A FORWARD -i eth0 -j ACCEPT

# Portforwarding from 10.144.2.21:8888 to 10.144.65.230:80
/sbin/iptables -t nat -A PREROUTING -p tcp -i eth0 --dport 8888 -j DNAT --to 10.144.65.230:80
/sbin/iptables -A FORWARD -p tcp -i eth0 -d 10.144.65.230 --dport 80 -j ACCEPT