一行命令安装PPTPD VPN,一键安装VPN（在xen或linux服务器上安装VPN服务）
PPTPD VPN是目前比较好用的vpn之一，为了方便ctohome的客户安装vpn服务，我们找到diahosting公开发布的一个“一行命令，一键在xen或linux服务器上安装VPN服务(PPTPD VPN)”的脚本，推荐给大家使用：
一行命令安装PPTPD VPN(注意，只在CentOS 5 32bits/64bits下测试通过，其他系统未测试):
wget http://www.CTOHome.com/linux-vps-pack/vpn-pptpd.sh;sh ./vpn-pptpd.sh;
用root登录ssh，复制粘贴上面一行命令，回车等待几分钟即可。
一键安装VPN完成后，会直接显示VPN用户名（默认就是vpn1和vpn2）和密码，
请留意下面的字样，密码中可能会有/=等特殊字符，但没有空格，复制密码的时候，小心不要复制了空格
VPN username: vpn1 password: rPpVvZUo
VPN username: vpn2 password: 55Y3ut6t
也可以在终端直接输入命令：
# this script was written by diahosting and edited by ctohome, free to use
mkdir -p /backup/www.ctohome.com/
cd /backup/www.ctohome.com/
yum remove -y pptpd ppp
iptables --flush POSTROUTING --table nat
rm -rf /etc/pptpd.conf
rm -rf /etc/ppp
wget http://www.ctohome.com/linux-vps-pack/vpn/dkms-2.0.17.5-1.noarch.rpm
wget http://www.ctohome.com/linux-vps-pack/vpn/kernel_ppp_mppe-1.0.2-3dkms.noarch.rpm
wget http://www.ctohome.com/linux-vps-pack/vpn/pptpd-1.3.4-1.rhel5.1.i386.rpm
wget http://www.ctohome.com/linux-vps-pack/vpn/ppp-2.4.4-9.0.rhel5.i386.rpm
yum -y install make libpcap iptables gcc-c++ logrotate tar cpio perl pam tcp_wrappers
rpm -ivh dkms-2.0.17.5-1.noarch.rpm
rpm -ivh kernel_ppp_mppe-1.0.2-3dkms.noarch.rpm
rpm -qa kernel_ppp_mppe
rpm -Uvh ppp-2.4.4-9.0.rhel5.i386.rpm
rpm -ivh pptpd-1.3.4-1.rhel5.1.i386.rpm
mknod /dev/ppp c 108 0
echo 1 > /proc/sys/net/ipv4/ip_forward
echo "mknod /dev/ppp c 108 0" >> /etc/rc.local
echo "echo 1 > /proc/sys/net/ipv4/ip_forward" >> /etc/rc.local
echo "localip 172.16.36.1" >> /etc/pptpd.conf
echo "remoteip 172.16.36.2-254" >> /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
pass1=`openssl rand 6 -base64`
if [ "$1" != "" ]
then pass1=$1
fi
pass2=`openssl rand 6 -base64`
if [ "$1" != "" ]
then pass2=$1
fi
echo -e "vpn1 pptpd ${pass1} *\nvpn2 pptpd ${pass2} *" >> /etc/ppp/chap-secrets
iptables -t nat -A POSTROUTING -s 172.16.36.0/255.255.255.0 -j SNAT --to-source `ifconfig | grep 'inet addr:'| grep -v '127.0.0.1' | cut -d: -f2 | awk 'NR==1 { print $1}'`
service iptables save
chkconfig iptables on
chkconfig pptpd on
service iptables start
service pptpd start
echo '';
echo '';
echo '';
echo '';
echo '';
echo '**********************************************************';
echo '******* PPTPD VPN service was installed *******';
echo '******* *******';
echo '******* 2 VPN username and password created *******';
echo '******* *******';
echo "******* VPN username: vpn1 password: ${pass1} *******";
echo "******* VPN username: vpn2 password: ${pass2} *******";
echo '******* *******';
echo '******* *******';
echo "******* VPN Script usage, note and upgrade: *******";
echo '******* *******';
echo '******* http://www.ctohome.com/FuWuQi/8b/291.html *******';
echo '******* *******';
echo "******* How to use VPN via windows xp: *******";
echo '******* *******';
echo '******* http://www.ctohome.com/FuWuQi/92/273.html *******';
echo '******* *******';
echo '**********************************************************';
echo '';
echo '';
