Everything I ever needed to know about OpenVPN:

http://openvpn.net/index.php/documentation/howto.html

The TUN/TAP device should already be built into the linode kernel, so all you need to do is set up the openvpn daemon.

Hi,

Im trying to setip OpenVPN on my linode too.

I am using Debian etch but I have a problem with the tun device.

There is no tun device setup.

dmesg | grep TUN

tun: Universal TUN/TAP device driver, 1.6

ifconfig -a | grep tun

tunl0 Link encap:IPIP Tunnel HWaddr

ls -l /dev/tun*

ls: /dev/tun*: No such file or directory

ls -l /dev/net/

ls: /dev/net/: No such file or directory

If I try to create it I get:

openvpn –mktun --dev tun0

Tue Oct 28 15:07:56 2008 Note: Cannot open TUN/TAP dev /dev/net/tun: No such file or directory (errno=2)

Tue Oct 28 15:07:56 2008 Note: Attempting fallback to kernel 2.2 TUN/TAP interface

Tue Oct 28 15:07:56 2008 Cannot open TUN/TAP dev /dev/tun0: No such file or directory (errno=2)

Tue Oct 28 15:07:56 2008 Exiting

My kernel is: 2.6.26-linode13

I have also tried with 2.6.18-something

Still there is no tun/tap device and I cannot create one. Any ideas?

Thanks

Hmm ok ignore my post I found it :P

I had to manually create the /dev/net/tun device with the command: mknod /dev/net/tun c 10 200

apt-get install udev

Just as an aside (in case you still have issues) – I followed the guide on the Wiki, worked great: http://www.linode.com/wiki/index.php/OpenVPN

@tlogic:

I had to manually create the /dev/net/tun device with the command: mknod /dev/net/tun c 10 200

This is exactly what worked for me. Thanks tlogic!

NB: I don't think it was specified, but this can be required on the client side. My linode was an openVPN client (on Debian Etch). After adding the device on the client, it was able to connect to an openVPN server (running CentOS 5.2) in another datacenter.

NB#2: put your client settings in /etc/openvpn/client.conf and they will be run at startup.