pptpd添加路由

iptables -A INPUT -i ppp0 -p tcp -m tcp --dport 1723 -j ACCEPT
iptables -A INPUT -i ppp0 -p tcp -m tcp --dport 47 -j ACCEPT
iptables -A INPUT -i ppp0 -p gre -j ACCEPT
iptables -A INPUT -i ppp0 -p udp -m udp --dport 53 -j ACCEPT
iptables -A FORWARD -s 172.16.0.0/24 -j ACCEPT
iptables -A POSTROUTING -s 172.16.0.0/24 -o eth0 -j MASQUERADE