In my FritzBox I need an IPv4 for DNS Server, not a name.
And for Pihole, do I need to set somewhere the IP?
I read something about pihole -r to reconfigure pihole, but there is no entry to decide again wether I want to use wifi or lan as there was in the initial settings.
But pihole -r does not offer any reconfiguration, it just does an update, maybe I am missing something here.
I will not use the wifi IP anymore, when I have switched the devices, only lan and I guess I will deactivate wifi in the new RP3 then.