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Re: [Doh] Mozilla's plans re: DoH

Valentin Gosu <valentin.gosu@gmail.com> Wed, 27 March 2019 10:22 UTC

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From: Valentin Gosu <valentin.gosu@gmail.com>
Date: Wed, 27 Mar 2019 11:22:16 +0100
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To: Matthew Pounsett <matt@conundrum.com>
Cc: Eric Rescorla <ekr@rtfm.com>, DoH WG <doh@ietf.org>
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Subject: Re: [Doh] Mozilla's plans re: DoH
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On Wed, 27 Mar 2019 at 11:19, Matthew Pounsett <matt@conundrum.com> wrote:

>
>
> On Wed, 27 Mar 2019 at 10:25, Eric Rescorla <ekr@rtfm.com> wrote:
>
>>     1. Copies of Firefox will be configured with a set of TRRs. Different
>>     regions may have different TRR sets or different defaults. In addition
>>     we may have DoH/TRR on by default in some regions and not others,
>>     especially initially.
>>
>
> Can I suggest you pick a default behaviour and stick with it?  This idea
> of having a different default configuration depending on what region the
> user is in (at what point?  at the time they downloaded it?  installed it?
> at runtime? how big is a "region" and how are you determining which one the
> user is in?) is going to be a bit of a support nightmare for IT departments
> with users in different regions.
>
> I'm also curious what your fallback plan is in the event that DoH is
> disabled or unreachable..  One hopes DoT will be tried next, before falling
> back to plan DNS.
>

Firefox uses the system's resolver via getaddrinfo if the DoH server can't
be reached.
If the OS's stub resolver uses DoT, then that's great. Otherwise it's
regular DNS.

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