DHCP and DNS are both provided by the "main" router (let's say 198.168.1.1) while OpenWrt C20i is at 192.168.1.2. Now I wish to use as DNS server 192.168.1.3 where I've installed Pi-Hole...
I've tried several ways found in this forum, on Reddit and elsewhere but I cannot achieve that DNS requests are served by Pi-Hole.
Any help? Any tips? Any link to a similar set up that I can use?
You need to tell your DHCP server to advertise 192.168.1.3 as the DNS server. This happens on your main router (since it is currently your DHCP server), not on your C20i.
I'm thinking to set OpenWrtC20i in order to serve a complete different network (i.e. 10.0.0.x) but I need some advice and help because I'm not a network person