Yes, you can.
Exactly how to do this will depend on your situation.

Here’s a bare-bones way to do it:

Load the kernel module.

/sbin/modprobe tun 

Create the tunnel device

cd /dev sudo MAKEDEV tun 

This will create /dev/net/tun .

Use openvpn to create tun0 .

sudo openvpn --mktun --dev tun0 

Optionally, edit /etc/network/interfaces, and bring up tun0 .

sudo ifup tun0