Step 1: declare the appropriate packages and modules

Download the openvpn.lrp and the ifconfig.lrp packages on your boot media and declare them in the syslinux.cfg file.

Download the tun.o module in the /lib/modules Bering directory. Be sure to download it from the directory corresponding to the version you are using!

Declare the tun.o module in /etc/modules and backup modules.lrp.

Important

If you use Bering 1.0 or 1.1 you will need to create first the /net/dev/tun device at boot time by adding the following statement in the /var/lib/lrpkg/root.dev.mk:

(..)
#Tun device
mknod net/tun c 10 200 >null 2>&1
(...)

Then backup initrd.lrp, reboot and check that your device is now created (ls -la /dev/net/tun).