Install NixOS.

No sorry, that’s a bit difficult for beginners. Can they reach each other via SSH with public key login already? Do they have fixed IPs already? Either static or via DHCP reservations?

Yeah I understand. Maybe someone will at some point invent a standard to have this kind of local DNS securely as well.

Thanks! I now went with a global DNS record. It’s very simple, given that I already have a domain.

Thanks! It’s really disappointing that devices nowadays come with these restrictions. This way, guests can’t easily use local services on my network.

Actually, I tried .home and it also fails … Well, I went with a global DNS record now.