@David-TP Will the "Allow List" also come to the Deco X53 DSL in time? May I remark that a free router provided by a service provider (Ultra Hub) supported "MAC address filtering" ("Allow List") over...

The Deco X53-DSL does not appear to support MAC address whitelisting. I find that unacceptable. The blacklisting mode is useless, as I do not know the MAC addresses of potential attackers.