Draytek Vigor2860 Series User Manual page 281

After finished the above settings, click OK button to save the settings.
T A C A C S +
T A C A C S +
It means Terminal Access Controller Access-Control System Plus. It works like RADIUS
does. Click the TACACS+ Setup to open the following page:
Available settings are explained as follows:
Item
Enable
Server IP Address
Destination Port
Shared Secret
Confirm Shared Secret
After finished the above settings, click OK button to save the settings.
Description
Check to enable TACACS+ feature.
Enter the IP address of TACACS+ server.
The UDP port number that the TACACS+ server is using.
The TACACS+ 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 secret.
Re-type the Shared Secret for confirmation.
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Vigor2860 Series User's Guide