# OpenVPN Uses both TCP and UDP. Port 1194 is the official IANA assigned port number for OpenVPN. It uses `ovpn` files to store the necessary configuration information (including shared secrets) necessary to establish a VPN connection. On linux you can use the `openvpn` command (followed by the path to the `ovpn` file) to establish a connection. It will generate a `tun` interface. An "Initialization Sequence Completed" message indicates a successful connection. Note that multiple tunnel interfaces could lead to routing conflicts, so you should make sure `tun0` is the only interface mentioned in the output.[^1] For a GUI client see https://tunnelblick.net/. [^1]: [[Meow Write-up#^7q3027]]