I want to specify a secondary upstream DNS server but I only want to use it if the primary actually fails. Currently it seems there is no priority so once it has started using the secondary, it keeps on using it. Is that possible to specify with the current implementation (V5)?

It's not possible via web gui, but dnsmasq can do it. Search for "strict-order" in the forum.

Fallback secondary upstream DNS

yubiuser June 1, 2020, 8:52pm 4

GUI Supported strict-order Feature Requests

Assume a local business has a domain 'taco.rentals'. They setup a pi-hole with some upstream DNS servers. For this example, lets say the upstream point to their local DNS server and OpenDNS for additional filtering. Every so often when the business tries to resolve local services such as ad.taco.rentals or fileserver.taco.rentals. These local domain names resolve about 70% of the time because some of the queries to the local DNS sever while others go to the OpenDNS server. You can set up strict-…

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