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Re: [Doh] Use of TXT records

Ben Schwartz <bemasc@google.com> Fri, 15 March 2019 19:24 UTC

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From: Ben Schwartz <bemasc@google.com>
Date: Fri, 15 Mar 2019 15:24:17 -0400
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To: "Hewitt, Rory" <rhewitt@akamai.com>
Cc: Paul Hoffman <paul.hoffman@icann.org>, DoH WG <doh@ietf.org>
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Subject: Re: [Doh] Use of TXT records
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On Fri, Mar 15, 2019 at 12:57 PM Hewitt, Rory <rhewitt@akamai.com> wrote:

> Ben,
>
>
>
> How has the use of TXT been a point of controversy in the past?
>

See for example
https://mailarchive.ietf.org/arch/msg/tls/b0DQpCStJ4RSlp7uVXSobS-ssjA


> Is it a general "TXT records are bad" or "Adding new TXT records is bad"
> or "TXT records have never been standardized or formatted consistently
> among their various uses, so there's always the possibility of clashes".
>

My understanding is that some DNS experts believe that TXT records should
be reserved for human-readable comments, while others believe that it is
more expedient to store data in TXT records than to define a new RRTYPE for
each new usage.


> Because I, for one, would agree with the last.
>
>
>
> Rory
>
>
>
> *From:* Ben Schwartz <bemasc=40google.com@dmarc.ietf.org>
> *Sent:* Friday, March 15, 2019 9:53 AM
> *To:* Paul Hoffman <paul.hoffman@icann.org>
> *Cc:* DoH WG <doh@ietf.org>
> *Subject:* Re: [Doh] Use of TXT records
>
>
>
> To be clear, I'm not objecting to this choice.  I'm merely noting that use
> of TXT has been a point of controversy in other discussions at the IETF.
> Some groups have decided to proceed with TXT, some have preferred to use
> different or new RRTYPEs, and some have not yet decided.  I would like the
> working group to consider this question soon so it doesn't delay consensus
> later.
>
>
>
> On Fri, Mar 15, 2019 at 12:27 PM Paul Hoffman <paul.hoffman@icann.org>
> wrote:
>
> On Mar 15, 2019, at 6:12 AM, Ben Schwartz <
> bemasc=40google.com@dmarc.ietf..org> wrote:
> > 5. Machine-readable content in a TXT record
>
> This is the first I had heard that people objected to using a TXT record,
> but I might have missed that part of the discussion. Given that this query
> is for a newly-created SUDN that is only used for looking up DoH
> information, there is no chance that the TXT record would be in use for
> anything else.
>
> Having said that, it would be quite easy for this document to create a new
> RRtype for this particular query. (I would not want to re-use the URI
> RRtype because it would take more effort to explain the priority and
> weight, as well as dealing with the common error of people not put the URI
> in quotations marks as is required for the URI RRtype.)
>
> --Paul Hoffman
>
>

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