PPTP VPN用的防火墙配置+不掉线+浏览网页速度比较快

# Generated by iptables-save v1.4.7 on Thu Nov 13 10:59:41 2014

*nat

:PREROUTING ACCEPT [283:47558]

:POSTROUTING ACCEPT [0:0]

:OUTPUT ACCEPT [2:148]

#192.168.60.0/24 PPTP设置的分配地址段

#192.168.10.110 PPTP服务器内网IP

#114.114.114.114 外网IP

-A POSTROUTING -s 192.168.60.0/24 -j SNAT --to-source 192.168.10.110

-A POSTROUTING -j MASQUERADE

-A POSTROUTING -s 192.168.60.0/24 -o eth0 -j MASQUERADE

-A POSTROUTING -s 192.168.60.0/24 -o eth0 -j MASQUERADE

-A POSTROUTING -s 192.168.60.0/24 -o eth0 -j SNAT --to-source 114.114.114.114

-A POSTROUTING -s 192.168.60.0/24 -o eth0 -j MASQUERADE

COMMIT

# Completed on Thu Nov 13 10:59:41 2014

# Generated by iptables-save v1.4.7 on Thu Nov 13 10:59:41 2014

*filter

:INPUT ACCEPT [50:3240]

:FORWARD ACCEPT [0:0]

:OUTPUT ACCEPT [26:2472]

-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT

-A INPUT -p tcp -m state --state NEW -m tcp --dport 1723 -j ACCEPT

-A FORWARD -i ppp+ -p tcp -m tcp --tcp-flags FIN,SYN,RST,ACK SYN -j TCPMSS --set-mss 1356

COMMIT

# Completed on Thu Nov 13 10:59:41 2014

"/etc/sysconfig/iptables" 23L, 952C

搭建的话百度一大堆，按着操作就行了