CentOS 6、7下pptp vpn一键安装脚本
之前有折腾过《CentOS 6、7下IPSEC/L2TP VPN一键安装脚本》，不稳定、不支持IOS，因此换成pptp，并已经添加到《lnmp一键安装包》。这个脚本可以单独使用，直接复制或下载执行即可，不用依赖安装包的其它脚本。

CentOS 6、7下pptp vpn一键安装脚本，安装如下：

wget http://mirrors.linuxeye.com/scripts/vpn_centos.sh
chmod +x ./vpn_centos.sh
./vpn_centos.sh
CentOS 6、7下pptp vpn一键安装脚本

脚本内容如下（vpn_centos.sh）：

!/bin/bash

Author: yeho

Blog: //linuxeye.com

Installs a PPTP VPN-only system for CentOS

Check if user is root

[ $(id -u) != "0" ] && { echo -e "\033[31mError: You must be root to run this script\033[0m"; exit 1; }
export PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
clear
printf "

LNMP/LAMP/LANMP for CentOS/RadHat 5+ Debian 6+ and Ubuntu 12+

Installs a PPTP VPN-only system for CentOS

For more information please visit //linuxeye.com/31.html

"
[ ! -e '/usr/bin/curl' ] && yum -y install curl
VPN_IP=curl ipv4.icanhazip.com
VPN_USER="linuxeye"
VPN_PASS="linuxeye"
VPN_LOCAL="192.168.0.150"
VPN_REMOTE="192.168.0.151-200"
while :; do echo

read -p "Please input username: " VPN_USER
[ -n "$VPN_USER" ] && break

done
while :; do echo

read -p "Please input password: " VPN_PASS
[ -n "$VPN_PASS" ] && break

done
clear
if [ -f /etc/redhat-release -a -n "grep ' 7\.' /etc/redhat-release" ];then

#CentOS_REL=7
if [ ! -e /etc/yum.repos.d/epel.repo ];then
    cat > /etc/yum.repos.d/epel.repo << EOF

[epel]
name=Extra Packages for Enterprise Linux 7 - $basearch

baseurl=http://download.fedoraproject.org/pub/epel/7/$basearch

mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-7&arch=$basearch
failovermethod=priority
enabled=1
gpgcheck=0
EOF

fi
for Package in wget make openssl gcc-c++ ppp pptpd iptables iptables-services
do
    yum -y install $Package
done
echo 'net.ipv4.ip_forward = 1' >> /etc/sysctl.conf

elif [ -f /etc/redhat-release -a -n "grep ' 6\.' /etc/redhat-release" ];then

#CentOS_REL=6
for Package in wget make openssl gcc-c++ iptables ppp
do
    yum -y install $Package
done
sed -i 's@net.ipv4.ip_forward.*@net.ipv4.ip_forward = 1@g' /etc/sysctl.conf
rpm -Uvh http://poptop.sourceforge.net/yum/stable/rhel6/pptp-release-current.noarch.rpm
yum -y install pptpd

else

echo -e "\033[31mDoes not support this OS, Please contact the author! \033[0m"
exit 1

fi
echo "1" > /proc/sys/net/ipv4/ip_forward
sysctl -p /etc/sysctl.conf
[ -z "grep '^localip' /etc/pptpd.conf" ] && echo "localip $VPN_LOCAL" >> /etc/pptpd.conf # Local IP address of your VPN server
[ -z "grep '^remoteip' /etc/pptpd.conf" ] && echo "remoteip $VPN_REMOTE" >> /etc/pptpd.conf # Scope for your home network
if [ -z "grep '^ms-dns' /etc/ppp/options.pptpd" ];then

 cat >> /etc/ppp/options.pptpd << EOF

ms-dns 223.5.5.5 # Aliyun DNS Primary
ms-dns 114.114.114.114 # 114 DNS Primary
ms-dns 8.8.8.8 # Google DNS Primary
ms-dns 209.244.0.3 # Level3 Primary
ms-dns 208.67.222.222 # OpenDNS Primary
EOF
fi
echo "$VPN_USER pptpd $VPN_PASS *" >> /etc/ppp/chap-secrets
ETH=route | grep default | awk '{print $NF}'
[ -z "grep '1723 -j ACCEPT' /etc/sysconfig/iptables" ] && iptables -I INPUT 4 -p tcp -m state --state NEW -m tcp --dport 1723 -j ACCEPT
[ -z "grep 'gre -j ACCEPT' /etc/sysconfig/iptables" ] && iptables -I INPUT 5 -p gre -j ACCEPT
iptables -t nat -A POSTROUTING -o $ETH -j MASQUERADE
iptables -I FORWARD -p tcp --syn -i ppp+ -j TCPMSS --set-mss 1356
service iptables save
sed -i 's@^-A INPUT -j REJECT --reject-with icmp-host-prohibited@#-A INPUT -j REJECT --reject-with icmp-host-prohibited@' /etc/sysconfig/iptables
sed -i 's@^-A FORWARD -j REJECT --reject-with icmp-host-prohibited@#-A FORWARD -j REJECT --reject-with icmp-host-prohibited@' /etc/sysconfig/iptables
service iptables restart
chkconfig iptables on
service pptpd restart
chkconfig pptpd on
clear
echo -e "You can now connect to your VPN via your external IP \033[32m${VPN_IP}\033[0m"
echo -e "Username: \033[32m${VPN_USER}\033[0m"
echo -e "Password: \033[32m${VPN_PASS}\033[0m"