How to enable TUN/TAP on openvz for a container

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First you have to check mod tun
by
#lsmod | grep tun
if you do not see anything then run

#modprobe tun
now again run
#lsmod | grep tun
you will see something like
tun 47872 0

#vzctl set VPSID --devices c:10:200:rw --save
#vzctl set VPSID --capability net_admin:on --save
#vzctl exec VPSID mkdir -p /dev/net
#vzctl exec VPSID mknod /dev/net/tun c 10 200
#vzctl exec VPSID chmod 600 /dev/net/tun

That's it.

:)