Upstream DNS preference/logic

General
1

I have enabled google, openDNS, quad9 & cloudflare as list of upstream DNS servers. I noticed majority of requests are forwarded to quad9 (see below). The first column is the count of requests went to that DNS server.

cat /var/log/pihole.log |grep forwarded|awk '{print $8;}'|sort|uniq -c
     74 1.0.0.1
    220 1.1.1.1
   3839 149.112.112.112
    760 208.67.220.220
    689 208.67.222.222
     74 8.8.4.4
    889 8.8.8.8
   3868 9.9.9.9

As you can see, over 7000+ went to quad9 while the rest had very few in comparison. Is there any specific logic pi-hole uses to choose which upstream DNS to use? Just curious.

2

Yes, there is. It's the fastest in your case.
https://docs.pi-hole.net/ftldns/dns-resolver/#improve-detection-algorithm-for-determining-the-best-forward-destination

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3

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