@GaborN I suggest comparing the response given by https://test-ipv6.com/ when going thru the Deco or not.

@Bar666xp The main, guest and IOT "wifi networks" offer some isolation, but all devices are in the same subnet. A device must know the wifi password to connect, they should not be "transferred" to...

@neilbaker86 Do you have any other network appliance (router, switch) in addition to the three Deco?

@cgarry I assume that the Deco nodes are not connected by Ethernet cables, is that correct? What you observe is, roughly, expected. Wifi works like a radio transmission and has a limited capacity....

@DarwinsFlinch Using the app, you can promote a satellite to main, or add a new Deco as main. That will preserve the configuration.

@Synfalle You can certainly use the Deco in AP mode, provided you wire it to one AX55. However, you will have two independent wifi networks, preferably with distinct SSID.