Draytek Vigor2926L User Manual page 179

Available settings are explained as follows:
Item
Enable
Authentication Port
RADIUS Client Access List
Vigor2926 Series User's Guide
Description
Check to enable internal RADIUS client feature.
Set a port number for internal RADIUS server.
Allow to configure that clients under specified domain (IPv4
and IPv6) must be authenticated with the specified shared
secret.
Enable - Check to enable RADIUS client feature.
Shared Secret - The RADIUS server and client share a secret
that is used to authenticate the messages sent between
them. Both sides must be configured to use the same shared
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