搭建pptp的防火墙过滤规则

iptables -A INPUT -p tcp --dport 1723 -j ACCEPT
iptables -A INPUT -i eth1 -p gre -j ACCEPT
iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE
iptables -A FORWARD -i ppp+ -o eth1 -j ACCEPT
iptables -A FORWARD -i eth1 -o ppp+ -j ACCEPT
service iptables save
service iptables restart