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Why does enabling DNS over HTTPS (DoH) cause Firefox to prefer IPv4?

  • 2 përgjigje
  • 1 e ka hasur këtë problem
  • 4 parje
  • Përgjigjja më e re nga Jason R. Coombs

Jason R. Coombs
Jason R. Coombs
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I've enabled DoH by setting the `network.trr.mode` value to `2`. After restarting, I notice that websites are defaulting to IPv4. For example, browsing to http://kame.net shows a static turtle and not the animated one. Switching the mode back to `0` and restarting, the site resolves to IPv6. I tried enabling `network.trr.early-AAAA` in the hopes that would restore a preference for IPv6, but no luck.

Is there a way to enable DoH without degrading the default IP stack to IPv4?

I've enabled DoH by setting the `network.trr.mode` value to `2`. After restarting, I notice that websites are defaulting to IPv4. For example, browsing to http://kame.net shows a static turtle and not the animated one. Switching the mode back to `0` and restarting, the site resolves to IPv6. I tried enabling `network.trr.early-AAAA` in the hopes that would restore a preference for IPv6, but no luck. Is there a way to enable DoH without degrading the default IP stack to IPv4?

Krejt Përgjigjet (2)

Paul
Paul
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  • Top 10 Contributor
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Hi

If you change the network.trr.mode to 3 it should force DoH regardless of site.

Jason R. Coombs
Jason R. Coombs I zoti i pyetjes
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Hi Seburo. I don't see how that suggestion at all addresses my concern. My issue is that when enabling DoH, it seems that the preference for IPv6 is lost and IPv4 is preferred, despite the behavior being different with DoH disabled.

I did try your suggestion to use mode 3, but at least in my current environment, it fails to resolve the addresses at all (possibly due to corporate restrictions).