I found the infos below on internet,

and check this topic on the forum about the same argument,

http://www.ourdreambox.com/ubbthreads.php?ubb=showflat&Number=2414#Post2414

Admin

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1. Get/Create/Download your .conf file
2. Telnet onto your Solo2
3. Type in "opkg install openvpn"
4. FTP to your Solo2 and navigate to the /etc/openvpn directory
* You can't see this directory by default, just enter it as a path
5. Copy your .conf file onto the Solo 2
6. Rename your .conf file to "client.conf"
7. Type in mkdir /dev/net
8. Type in mknod /dev/net/tun c 10 200
9. From Telnet, type in /etc/init.d/openvpn start

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Initially thought OpenVPN was not installed. From Menu/Setup/../Network/OpenVPN showed "Enabled" but "Not Running" and when I clicked green it did not change and nothing was displayed in the log file.

I logged in via ssh and uninstalled OpenVPN and then re-installed to see what was going on - no errors.

I executed "openvpn" from the command line and hey presto i got output back from openvpn.

So next step was to get the config files for your OpenVPN connection.

MY provider ( AirVPN ) have a nice web interface that create the config files for you.

I was supplied with

ca.crt
user.crt
user.key

and a number of .ovpn files which are the ..config files to configure openVPN connection.

i copied all files to /etc/openvpn

and then from the command line i executed

openvpn ./italy.ovpn

but during the openvpn connection process i was getting error

Tue Jan 15 08:25:57 2013 Note: Cannot open TUN/TAP dev /dev/net/tun: No such file or directory (errno=2)

After some research it was clear the device /dev/net/tun needed to be created - i guess the question is why this isn't installed when you install OpenVPN , there maybe a good reason for this.

i found the following statements and ran

mkdir /dev/net
mknod /dev/net/tun c 10 200

I then re-ran

openvpn ./italy.ovpn

and got connected.

i stopped everything.

i renamed italy.ovpn to client.conf*

and then then from the command line executed

/etc/init.d/openvpn start
*

... need to work out how to log some info to log file but apart from that it looks to be working ok for me.