Since today, my Android devices do not resolve local DNS names via my local PiHole.
In the Settings/Network/Advanced Settings, "Private DNS" was enabled.
Disabled and, Firefox/Network utilities/Ping Tools can still not resolve "plex.lan" (Plex server) or "licht.lan" (Zigbee Gateway) or any other internal domain.
Even with static IP settings, nothing works.
Any clue where I can tell Android "Use the DNS server announced from DHCP"?
The problem occurs on all my android devices simultaneous.
No problem on my Laptop or Workstation.
Note: The Ping Tool/DNS Checker test with the "default" server was done, when a static IP was configured, so there should be used the LAN internal DNS Server, but it clearly must use something else.
Using Wireguard as a tunnel into my network works. But that can't be the solution when I'm already connected to my LAN.
EDIT: The problem was not my Phones/Tablets, but my router that enabled IPv6 automatically and used the DNS Server from my Provider via IPv6


