MAC Address spoofing

[samgbuyi]

I have some devices connected to the internet but i cant locate them on Wireless controller (i did not register them on the controller but they gain internet access) but i can see their MAC Address on Meraki. Anyone with possible assistance with blocking MAC Address spoofing?

Each time i block the device it comes with a different MAC Address again and generate IP automatically

Please help

Thanks in advance 

[PhilipDAth]

If I understand correctly; you have a non-Meraki WiFi system sitting behind a Meraki MX.

You wont be able to do anything on the MX to stop MAC address spoofing being done on a client connected to a WiFi controller connected on another system.

You should consider using some kind of authentication system on your WiFi network, such as WPA2-Enterprise mode, or splash page authentication.

On the MX you can configure a splash page with authentication.

https://documentation.meraki.com/MX/Access_Control_and_Splash_Page/Splash_Page

You could also consider looking at what the customer is accessing.  If it is something that is not commonly used you could consider blocking that type of traffic.