tunl0

tunl0: flags=128<NOARP>  mtu 1480
      tunnel   txqueuelen 1000  (IPIP Tunnel)
      RX packets 0  bytes 0 (0.0 B)
      RX errors 0  dropped 0  overruns 0  frame 0
      TX packets 0  bytes 0 (0.0 B)
      TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

OpenVPN, Tunnelblick, OpenVPN Connect, .ovpn, CRL, systemctl status openvpn, /var/log/openvpn.log, /lib/systemd/system/openvpn.service, systemctl status openvpn-server@server, /etc/openvpn/, /etc/openvpn/server.conf, /etc/pam.d/openvpn, /etc/openvpn/users, openvpn --help, OpenVPN changelog, Pritunl, tunl0