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Re: [Doh] meta qtypes

Ólafur Guðmundsson <olafur@cloudflare.com> Mon, 19 March 2018 12:16 UTC

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From: Ólafur Guðmundsson <olafur@cloudflare.com>
Date: Mon, 19 Mar 2018 12:15:59 +0000
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To: Patrick McManus <pmcmanus@mozilla.com>
Cc: DoH WG <doh@ietf.org>
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Subject: Re: [Doh] meta qtypes
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I would prefer if the draft did NOT even consider Meta types, but limited
itself to pure queries i.e. excluded query type's 128..255
Additionally doing other things like Updates and Zone transfers should
involve different meta types (lets learn from experience here not repeat
mistakes)

While I do not mind having the udpdnswire format for now,
I think most users would prefer to use a simple Jason format of answers
like the ones that Google provides
https://dns.google.com/resolve?name=www.cloudflare.com?type=aaaa

As for a more expressive format that supports doing DNSSEC validation that
is IMHO a separate  goal,
as we need to think about usage cases i.e. does the client trust the
resolver or not if the client trusts then the AD bit good enough, if the
client wants to verify then the client should express that in the query
either by adding field or ask for different media type.
Just MHO

Olafur


On Sun, Mar 18, 2018 at 3:44 PM, Patrick McManus <pmcmanus@mozilla.com>
wrote:

> Hi - DoH itself doesn't require axfr/etc anywhere that DNS would not (I'm
> not aware of whether it does or not) - the text is just meant to give the
> HTTP considerations when it does carry larger DNS responses such as that.
>
> WRT HTTP caching - section 4 of DoH talks about how HTTP freshness
> lifetimes should be set for DoH responses. Is there something different
> here?
>
> -Patrick
>
>
> On Sun, Mar 18, 2018 at 2:38 PM, Miek Gieben <miek@miek.nl> wrote:
>
>> Hi,
>>
>> -03 has the following text in section 7.1.
>>
>>   Other types of DNS data, such as
>>   zone transfers, may be larger and benefit more from revalidation.
>>   DNS API servers may wish to consider whether providing these
>>   validation enabling response headers is worthwhile.
>>
>> this implies DoH servers need to support IXFR/AXFR (fine), but that
>> replies to these may now be cached? I think this is new behavior from a DNS
>> standpoint.
>>
>> (Should the draft also mention dynamic updates, notify messages and other
>> opcodes as being supported?)
>>
>> /Miek
>>
>> --
>> Miek Gieben
>>
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