VPN on linux ::: Virtual Private Network :::

I need VPN to connect to the school computer (server with Linux Ubuntu) from the home. It uses Point-to-point protocol (PPTP) , which use MPPE (Microsoft Point-to-Point Encryption ) for encryption of packages PPP. It is Microsoft method for implementing VPN.
 
Here is the easiest way how to do it, if you are not furious about (tray) window applications:

1. Install networkmanager and plugins supporting VPN connection.
Packages are usually available in repositories:

network-manager-applet 
 
2. VPN PPTP needs Plugins:

networkmanager-pptp

Reboot. The file is autostarting at launching (the Desktop Entry is in  /etc/xdg/autostart/nm-applet.desktop). To enable networking through NetworkManager write sudo NetworManager. To (re)open its GUI in tray write nm-applet. The name is in Desktop Entry as EXEC.
 
You can ask in terminal about status of your connection by nmcli -p c
-p means pretty
c connection

If you get furious by windows applications:

1. Install pptpclient.
2. Set up your_tunnel in /etc/ppp/peers/<TUNNEL>
3. Debug: pon my_tunnel debug dump logfd 2 nodetach (if it is correctly it should no stop)
3. Connection to VPN: pon my_tunnel
4.Routing: the best run as sudo..
To access anything on the remote network, you need to add a new route to your routing table.

 Deamon to run:  pon my_tunnel
 Check if you have ppp0 device: ip addr
  Then:  
  ip link set ppp0 up
  ip  route add X.Y.10.0 dev ppp0

• the tunnel from the client to the server is ppp0,
• the remote network uses addresses starting with X.Y.

4. check all your connections: netstat -nputw
5. Enjoy!! :D)

PPTP client is compatible with Windows, Linux, OpenBSD, FreeBSD, NetBSD..

PPTP Client was known as pptp-linux and was written by C. Scott Ananian under RedHat. Then it was developed under OpenSSL software project.