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by TravelTechGuy 2944 days ago
Can confirm. If I have a secondary DNS specified in my router, other than my pi-hole, it becomes useless. My guess is the router is either measuring response time, and goes with the most efficient, or otherwise round-robining the requests. Either way, requests bypass the pi-hole in such quantities that it became useless.

PS: someone here mentioned that this behavior is OS-dependent - nope, this happens on the router level, and all devices in my apartment suffer.
2 comments
jschwartzi 2944 days ago
It depends on how your router's DHCP server is configured. If you configure your router to pass its own IP address out as the DNS server for the local subnet then the router's behavior dictates how DNS works. If your router is passing out an external DNS in the DHCP configuration, then you'll get OS-dependent behavior.

My router uses a DNS resolver internally, and it will spread-cast to multiple DNS servers and use the quickest response it can get. It also caches using the TTL in the DNS response, and so it will serve up cached records transparently.

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detaro 2944 days ago
Then your devices are likely using your router as a DNS resolver, which in turn talks to your pihole and the external one. And thus it depends on your router's OS what it does.
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