There are multiple ways to setup DNS in a network. This here is only a suggestion.
The most easy setup is to distribute the DNS information to clients via the DHCP. All clients will receive this information upon updating their DHCP lease. DNS requests will then take the following way:
Client -> Pi-hole -> Upstream DNS ServerThe upstream DNS server can either be a public DNS or the router.
Like Fritz!Box, many routers offer a built-in DHCP server. To use this setup, enter the Pi's IP address in the router config under Heimnetz/Netzwerk/Netzwerkeinstellungen/IP-Adressen/IPv4-Konfiguration/Heimnetz.
Caution: Be careful to not create a DNS loop when determining what the upstream server of what DNS server is (router to Pi-hole and vice-versa).
Now, add public DNS servers to the router's settings under Internet/Zugangsdaten/DNS-Server.
In Pi-hole, only the Fritz!Box should be added as an upstream server. Check Use Conditional Forwarding and type in the following values:
- Local network in CIDR notation: 192.168.50.0/24 (adjust to the network)
- IP address of your DHCP server (router): 192.168.50.1 (IPv4 address of the Fritz!Box)
- Local domain name (optional): fritz.box
The router is now defined as the upstream server of Pi-hole, while the public dns servers are the upstream servers of the router.
So, the final path DNS requests take, looks like this:
Client -> Pi-hole -> Router -> Public DNS ServerBy not using Conditional Forwarding and defining public upstream servers directly in Pi-hole, devices will only appear as IP addresses and also won't be resolvable by their hostname.1
TODO
- https://docs.pi-hole.net/routers/fritzbox-de
- https://discourse.pi-hole.net/t/pi-hole-und-fritzbox-setup-anleitung/7313/214
- https://forum-raspberrypi.de/forum/thread/51020-fritzbox-und-pihole-korrekt-konfigurieren-damit-alle-geraete-funktionieren/
- https://www.kuketz-blog.de/pi-hole-einrichtung-und-konfiguration-mit-fritzbox-adblocker-teil1/
- there are also other tips in there, like deactivating bluetooth to save energy