Install VPN PPTP Server on CentOS 6
n this tutorial, I will use pptp as protocol to connect to VPN server using a username and password, with 128 bit MPPE encryption. Variable as below:
OS: CentOS 6 64bit
VPN server: 209.85.227.26
VPN client IP: 209.85.227.27 - 209.85.227.30
VPN username: vpnuser
Password: myVPN$99
1. Install ppp via yum:
$ yum install ppp -y
2. Download and install pptpd (the daemon for point-to-point tunneling). You can find the correct package at this website http://poptop.sourceforge.net/yum/stable/packages/ :
$ cd /usr/local/src
$ wget http://poptop.sourceforge.net/yum/stable/packages/pptpd-1.3.4-2.el6.x86_64.rpm
$ rpm -Uhv pptpd-1.3.4-2.el6.x86_64.rpm
3. Once installed, open /etc/pptpd.conf using text editor and add following line:
localip 209.85.227.26
remoteip 209.85.227.27-30
4. Open /etc/ppp/options.pptpd and add DNS resolver value:
ms-dns 8.8.8.8
5. Lets create user to access the VPN server. Open /etc/ppp/chap-secrets and add the user as below:
vpnuser pptptd myVPN$99 *
6. We need to allow IP packet forwarding for this server. Open /etc/sysctl.conf via text editor and change line below:
net.ipv4.ip_forward = 1
7. Run following command to take effect on the changes:
$ sysctl -p
8. Allow IP masquerading in IPtables:
$ iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
9. Turn on the pptpd service at startup and reboot the server:
$ chkconfig pptpd on