Proof?

I read 15 different sites about DNS and not a one of them claimed anything like this. They universally all stated that your network attached devices would use the 1st one unless it didn’t respond and only use the 2nd one if the 1st one did not.

So once again, I ask “Can you send me some more information on this” and not just claim it without any backup information?

I apologize if I am coming off rude, just my BS meter is getting close to the red zone and I would really appreciate some reliable evidence.

Yeah, looks like you don’t know what you’re talking about.

The second ipv4 DNS address is for redundancy and every network connected system will use the first one as long as it responds.

It’s perfectly fine to have a single pihole and use something like quad9 as a failover in the unlikely event that your pihole goes down unexpectedly.

Can you send me some more information on this because this is the first I’ve ever heard that it would not automatically pick the fastest closest and most responsive DNS system available.

No remote DNS server will ever be as fast as one that is local

If you’re router has a failover DNS option, usually listed as DNS 2, I would set something like quad 9 as your backup DNS. Address is 9.9.9.9.

If you don’t want to do that, then having a second instance of pihole running as the secondary DNS is pretty much your only good option