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How to Enable TUN/TAP Module in OpenVZ

OpenVZ supports VPN inside a container via kernel TUN/TAP module and device. To allow VPS #101 to use the TUN/TAP device the following should be done: 
 
#101 - VPS  id. Replace #101 with your VPS id.
 
Make sure the tun module has already loaded on the Node.
[root@Node /]#  lsmod | grep tun
 
If not listed, then load the tun module with the below command
[root@Node /]# modprobe tun

 [root@Node /]#  lsmod | grep tun
  tun                    82432  6
 
Run the following command in Node:
 
[root@Node /]#  vzctl set 101 --devnodes net/tun:rw --save
[root@Node /]#  vzctl set 101 --devices c:10:200:rw --save 
[root@Node /]#  vzctl stop 101 
[root@Node /]#  vzctl set 101 --capability net_admin:on --save
[root@Node /]#  vzctl start 101 
[root@Node /]#  vzctl exec 101 mkdir -p /dev/net
[root@Node /]#  vzctl exec 101 chmod 600 /dev/net/tun 
 
To check TUN/TAP is enabled or not :
[root@Node /]# vzctl enter 101
 
Inside the VPS: 
[root@vps /]# cat /dev/net/tun
cat: /dev/net/tun: File descriptor in bad state     # It means the TUN/TAP is enabled on your VPS.
 
 cat: /dev/net/tun: No such device     #  If you receive like this, then the TUN/TAP has not enabled on your VPS . Try to enable TUN/TAP again and check.


Source: http://wiki.openvz.org/VPN_via_the_TUN/TAP_device
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