Install pptp-linux package
sudo apt-get install pptp-linux
Create a PPTP connection profile
sudo pptpsetup --create <nameofvpn> --server <vpn.server.com> --username vpnuser
When you hit ENTER you should be asked for the VPN password.
The profile will be saved in /etc/ppp/peers/
To enable the VPN connection
sudo pon <profilename>
You can see your PPTP connection using ifconfig -s. It should be listed under ppp0.
To kill the VPN connection
sudo poff
A route may need to be added once the VPN connection is made. To do this, type:
sudo route add -net "0.0.0.0/0" dev "ppp0"
To check if the route is successful:
netstat -a | grep "/var/run/pptp/"