Captive Portal - How to change to use MAC address the determine the session?

[jackywong1]

Hi All

I am a newbie on Opnsense. Currently I would like to use it as a Captive Portal. The authentication is very simple, just anonymous and click the signin button (no need username and password). I have done the above configuration properly. However, system use client device's IP address as key to determine whether the session is expired or not.

May I know how I can change to use MAC address as a key to determine whether a session should be authenticate again or not?


Thanks