it to connect public networks in different areas into inner network via a specialtunnel.VPN ConfigurationField name explanationVPN IP Shows the current VPN IP addressSelect UDP Tunnel (VPN Tunnel) or VPN L2TP. You can choose only one forcurrent state. After you select it, you’d better save configuration and rebootyour device.Enable VPN Select it or not to enable or disable VPN;VPN Server Addr Set VPN L2TP Server IP address