I wanted my Parental Controls to control screen time for my son's PC. I have set that up by his MAC Address which is tied to his IP. But, I have seen that he can access the Wi-Fi using a random MAC address on his phone.
If he sets that up on his PC as well (connected to LAN), I'd like to deny access for any new devices that are not already known (whitelist).
How do I do that? (RT-AX58U)