centos5/6 快速安装 VPN(pptp)

判断 ppp 是否可用

$ cat /dev/ppp
cat: /dev/ppp: No such device or address

如果提示

Permission denied

的话应该是vps不支持

安装 ppp 和 iptables

$ yum -y install ppp iptables
$ cp -rpf /etc/sysconfig/iptables /etc/sysconfig/iptables.pptpsave
$ cd /usr/src

安装 pptp

# for CentOS 6.x 32bit
$ wget http://poptop.sourceforge.net/yum/stable/rhel6/i386/pptpd-1.3.4-2.el6.i686.rpm
# for CentOS 6.x x64
$ wget http://poptop.sourceforge.net/yum/stable/rhel6/x86_64/pptpd-1.3.4-2.el6.x86_64.rpm
# for CentOS 5.x 32bit
$ wget http://poptop.sourceforge.net/yum/stable/rhel5/i386/pptpd-1.3.4-2.rhel5.i386.rpm
# for CentOS 6.x x64
$ wget http://poptop.sourceforge.net/yum/stable/rhel5/x86_64/pptpd-1.3.4-2.rhel5.x86_64.rpm

链接有可能失效了 Google下文件名就能找到啦

安装下载的 pptp

$ rpm -ivh pptpd-1.3.4-2.el6.i686.rpm

vi /etc/sysctl.conf

net.ipv4.ip_forward = 1

找到该属性 改成1

输入下面的命令

sysctl -p
echo "localip 192.168.240.1" >> /etc/pptpd.conf
echo "remoteip 192.168.240.101-200" >> /etc/pptpd.conf
echo "ms-dns 8.8.8.8" >> /etc/ppp/options.pptpd
echo "ms-dns 8.8.4.4" >> /etc/ppp/options.pptpd
iptables --flush POSTROUTING --table nat
iptables --flush FORWARD
iptables -A INPUT -p tcp -m tcp --dport 1723 -j ACCEPT
iptables -A INPUT -p gre -j ACCEPT
iptables -t nat -A POSTROUTING -s 192.168.240.0/24 -o eth0 -j MASQUERADE
service iptables save
service pptpd restart
service iptables restart
chkconfig pptpd on
chkconfig iptables on

加入 VPN 账号

vi /etc/ppp/chap-secrets

格式为

username pptpd password *

参考 http://www.vixual.net/blog/archives/32