If you’re on Linode, you can simply rebuild your instance with the PPTP VPN Installer StackScript.

Note: OpenVZ users, currently one of the iptables rules used in this script is not virtualised in OpenVZ (masquerade). This means you will need to run this line of code once you have finished installing the CentOS PPTP VPN script for it to work:

iptables -t nat -A POSTROUTING -j SNAT --to-source x.x.x.x

Where x.x.x.x is your venet0 IP address

In addition to this, you will also need OpenVZ kernel 2.6.32

How do I connect to my VPN?
You can now connect to your VPN using your servers IP as the hostname (this depends on your VPN client)

The default username and password for your VPN server is:

Username: myuser
Password: mypass

What’s the Code?
See below for the code in all its glory; keep in mind that you might need to adjust a few of the parameters (localip, remoteip) to suit your requirements:

#!/bin/bash -x

#
# drewsymo/VPN
#
# Installs a PPTP VPN-only system for CentOS
#
# @package VPN 2.0
# @since VPN 1.0
# @author Drew Morris
#

(

VPN_IP=`curl ipv4.icanhazip.com>/dev/null 2>&1`

VPN_USER=”myuser”
VPN_PASS=”mypass”

VPN_LOCAL=”192.168.0.150″
VPN_REMOTE=”192.168.0.151-200″

yum -y groupinstall “Development Tools”
rpm -Uvh http://poptop.sourceforge.net/yum/stable/rhel6/pptp-release-current.noarch.rpm
yum -y install policycoreutils policycoreutils
yum -y install ppp pptpd
yum -y update

echo “1” > /proc/sys/net/ipv4/ip_forward
sed -i ‘s/net.ipv4.ip_forward = 0/net.ipv4.ip_forward = 1/g’ /etc/sysctl.conf

sysctl -p /etc/sysctl.conf

echo “localip $VPN_LOCAL” >> /etc/pptpd.conf # Local IP address of your VPN server
echo “remoteip $VPN_REMOTE” >> /etc/pptpd.conf # Scope for your home network

echo “ms-dns 8.8.8.8″ >> /etc/ppp/options.pptpd # Google DNS Primary
echo “ms-dns 209.244.0.3″ >> /etc/ppp/options.pptpd # Level3 Primary
echo “ms-dns 208.67.222.222″ >> /etc/ppp/options.pptpd # OpenDNS Primary

echo “$VPN_USER pptpd $VPN_PASS *” >> /etc/ppp/chap-secrets

service iptables start
echo “iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE” >> /etc/rc.local
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
service iptables save
service iptables restart

service pptpd restart
chkconfig pptpd on

echo -e ‘\E[37;44m'”\033[1m Installation Log: /var/log/vpn-installer.log \033[0m”
echo -e ‘\E[37;44m'”\033[1m You can now connect to your VPN via your external IP ($VPN_IP)\033[0m”

echo -e ‘\E[37;44m'”\033[1m Username: $VPN_USER\033[0m”
echo -e ‘\E[37;44m'”\033[1m Password: $VPN_PASS\033[0m”

) 2>&1 | tee /var/log/vpn-installer.log