@Alexandre. The second character of those artificial MAC address is 2, 6, A or E. And if the purpose of using such a MAC address is to remain anonymous, the device will obviously not provide its name...

@WindowsNT_Cork How do you know "They are obviously not authorized on the network"?" "UNKNOWN" simply means those devices choose to remain anonymous and did not provide their name to the DHCP server.

@MPH4077 You cannot connect satellite Deco to the same switch (connected to the modem) if your Deco operates in Router mode.

@CCDan In the picture, all Decos have their customized names, right?

@PeterGeelhoed I care about the internet, and I am satisfied that the LED of my Deco turns red when my mesh is disconnected from Internet. That is one of the numerous advantages, for my domestic...

@PetarV Deco perhaps does not behave correctly because you assigned reserved address outside the DHCP range. One way to avoid the issue ("some new devices are unable to connect sometime") is perhaps...