mary DNS Server: Clients will first attempt to use the primary DNS server specified in their network settings. This ser
What’s the point tho? If your PiHole fails you need to know otherwise you could be risking days / months of web surfing in the fallback DNS server without even noticing it.
As for a reply, there’s no RFC that specifies that a specific order is applied to DNS servers. So in short, you can’t have a fallback that is reliable and most operating systems will just load balance or opportunistically pick between the two.