This can be done from the control panel.
2. Click Submit to save settings.
3. Stop the VPS from the control panel.
4. Start the VPS from the control panel.
To check if TUN is enabled run the following command,
~# cat /dev/net/tun
Output:
cat /dev/net/tun: File descriptor in bad state
Then TUN/TAP is enabled on your VPS.
cat: /dev/net/tun: No such device
Then TUN/TAP is not enabled on your VPS.