iptables -A INPUT -p tcp -m tcp –dport 1723 -j ACCEPT
iptables -A INPUT -p tcp -m tcp –dport 47 -j ACCEPT
iptables -A INPUT -p gre -j ACCEPT
iptables -A FORWARD -m state –state RELATED,ESTABLISHED -j ACCEPT
iptables -t nat -A POSTROUTING -s 192.168.10.0/24 -o eth0 -j MASQUERADE
iptables -P FORWARD ACCEPT