You can enable TUN/TAP on your OpenVZ VPS from the SolusVM control panel. Click Manage > Settings > Enable TUN/TAP.

To check if TUN/TAP is working correctly, enter this command over SSH:
# cat /dev/net/tun

The output should be:
cat: /dev/net/tun: File descriptor in bad state

Note: Enabling TUN/TAP also enables certain settings required for IPsec and dnsmasq.

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