ZyXEL
RADIUS Server Port: The port number used to connect to the authentication server.
RADIUS Server Shared Secret: A
MAC Address Authentication: If this is selected, the user must connect from the same computer whenever logging into the wireless network.
Advanced:Optional Backup RADIUS Server:This option enables configuration of an optional second RADIUS server. A second RADIUS server can be used as backup for the primary RADIUS server. The second RADIUS server is consulted only when the primary server is not available or not responding. The fields Second RADIUS Server IP Address, RADIUS Server Port, Second RADIUS server Shared Secret, Second MAC Address Authentication provide the corresponding parameters for the second RADIUS Server.