VPN: PPTP Server installation and config
While not the most secure of the VPN solutions out there,
PPTP is by far the simplest to get up and running.
Lets dive right into installing PPTP on a Debian distro. (I'm using Ubuntu server 12.10 64bit)
Install necessary packages
sudo aptitude install ppp pptpd iptables
Configure PPTP IP ranges on the server
sudo vim /etc/pptpd.conf
At the bottom of the file add
localip 192.168.0.2 remoteip 192.168.0.100-150
This sets up the PPTP server to use IP 192.168.0.2 while distributing the IP range 192.168.0.100 to 192.168.0.150 to PPTP clients. Change these as you wish as long as they are private IP addresses and do not conflict with IP addresses already used by your server.
Configure DNS servers to use when clients connect to this PPTP server.
sudo vim /etc/ppp/pptpd-options
Find lines containing ms-dns and add
ms-dns 192.168.0.1 ms-dns 188.8.131.52
I Like to use my local DNS server as the primary DNS, This way my local machine addresses will resolve.I do use Google's DNS as my secoundary. You can specify other DNS servers if you know their addresses.
Now add a test account
sudo vim /etc/ppp/chap-secrets Append a line at the bottom 1 # client server secret IP addresses test pptpd abcd1234 *
Configure NAT for PPTP connections, otherwise you cannot reach anywhere from this server
sudo vim /etc/rc.local
adding to the bottom right before exit 0
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
Enable IPv4 forwading
sudo vim /etc/sysctl.conf
Uncomment the line
Then reload the configuration
sudo sysctl -p Done. Reboot to see if everything goes well.