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Re: [Add] [Ext] Draft Posting: CNAME Discovery of Local DoH Resolvers

Ted Lemon <mellon@fugue.com> Wed, 01 July 2020 15:45 UTC

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From: Ted Lemon <mellon@fugue.com>
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Date: Wed, 01 Jul 2020 11:45:24 -0400
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Cc: tirumal reddy <kondtir@gmail.com>, ADD Mailing list <add@ietf.org>, Paul Vixie <paul@redbarn.org>
To: Michael Richardson <mcr+ietf@sandelman.ca>
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Subject: Re: [Add] [Ext] Draft Posting: CNAME Discovery of Local DoH Resolvers
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On Jul 1, 2020, at 11:39 AM, Michael Richardson <mcr+ietf@sandelman.ca> wrote:
> mean that other management protocols (such as DHCP!) can be done securely.
> We never could get DHCP security to work, because device never had identities
> we could leverage.

That’s sort of maybe a fair point, but is authenticating DHCP when you’ve already authenticated layer two adding any real value?

> This is far afield from whether a *browser* should use a CNAME rather than a
> new RR-type for discovery.  It feels to me DNS is being used as a hammer
> because browsers don't have access to DHCP.

This is _precisely_ the sort of thing that RFC6763 does well.  DHCP isn’t a particularly good way of solving this problem. If you want trustworthy information about network services, why not use a service discovery protocol?

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