For my understanding: while running unbound on an asus RT-AC68U (Firmware-Version: 386.7_2), and running a pihole in the LAN on a dietpi, I configured the upstream DNS for the pihole with the IP of the router. Should the WAN-DNS-settings of the router point to the IP of the router itself, to the IP of the pihole or to an external DNS e.g. 1.1.1.1?