How to use external Radius server for authentication?
• On the web configuration interface, please choose User Authentication > Authentication Configuration and select Server 3 (Auth Method – RADIUS). • Click Radius Setting. (If you choose Sever 1 or Server 2 in the previous step, you should change the Authentication Method to Radius first.) • Configure the Radius settings. Then click Apply to save the settings. • Key in the Postfix name. Then click Apply to save the settings. • Enable the RADIUS server and click Apply to complete the set up.