Re: [Doh] [Ext] Associating a DoH server with a resolver

Paul Hoffman <paul.hoffman@icann.org> Wed, 24 October 2018 01:14 UTC

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From: Paul Hoffman <paul.hoffman@icann.org>
To: Martin Thomson <martin.thomson@gmail.com>
CC: DoH WG <doh@ietf.org>
Thread-Topic: [Ext] [Doh] Associating a DoH server with a resolver
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Date: Wed, 24 Oct 2018 01:14:29 +0000
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Subject: Re: [Doh] [Ext] Associating a DoH server with a resolver
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On Oct 23, 2018, at 6:10 PM, Martin Thomson <martin.thomson@gmail.com> wrote:
> 
> On Wed, Oct 24, 2018 at 12:08 PM Martin Thomson
> <martin.thomson@gmail.com> wrote:
>> Why do the IP-based spelunking?  It requires that the resolver (which
>> might not be a DoH server) do HTTP as well.  Can't you define a record
>> that could be placed at the resolver-addresses.arpa name?  I hesitate
>> to say TXT, but I can't think of a good reason not to use that in this
>> case.  Multiple such records could identify different DNS-over-foo
>> variants.
> 
> Oh, I forgot.  IP-based certificates complicate things considerably,
> and will make this impossible to deploy in many cases (think of the
> many resolvers with 1918 addresses, for example).

They don't make it "impossible" by a long shot. Plenty of resolvers, even corporate resolvers, have public addresses.

--Paul Hoffman