Hello all. I need to know how to prevent more than one connection for PPPoE user when I use external RADIUS for authentication.

If I use Local Secret the user is limited to Only One session as per the PPP profile assigned to him.

If Local Secret does not exist and user does exist on RADIUS with the same PPP profile it is able to achieve many sessions despite the Only One being checked off.

I have read that there is a RADIUS Attribute that should solve my issue but can not find any reference to which attribute it is in the Mikrotik Wiki or anywhere on the web.

Any help is appreciated!

Mikrotik ROS 6.40.4 on CCR1009-8G-1S-1S+

It all really depends on how your radius server is configured. What type of radius server you are using?
On free-radius, there is a parameter named 'simultanous-use'
Example: Also Uncomment simul_count_query to enable simultaneous use checking in dialup.conf

Google for more