We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

Avatar for Username

搜索 | 用户支持

防范以用户支持为名的诈骗。我们绝对不会要求您拨打电话或发送短信，及提供任何个人信息。请使用“举报滥用”选项报告涉及违规的行为。

详细了解

话题已存档。 如果需要帮助请提出新问题。

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

Jason R. Coombs
Jason R. Coombs
more options

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?

所有回复 (2)

Paul
Paul
  • Top 25 Contributor
  • Moderator
more options

Hi

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

Jason R. Coombs
Jason R. Coombs 提问者
more options

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).