Re: [OPSAWG] [Mud] changes to draft-richardson-opsawg-mud-iot-dns-considerations-03.txt

Michael Richardson <mcr+ietf@sandelman.ca> Sat, 26 September 2020 23:02 UTC

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From: Michael Richardson <mcr+ietf@sandelman.ca>
To: tirumal reddy <kondtir@gmail.com>, opsawg <opsawg@ietf.org>, mud@ietf.org, Eliot Lear <lear=40cisco.com@dmarc.ietf.org>
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Date: Sat, 26 Sep 2020 19:02:37 -0400
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Subject: Re: [OPSAWG] [Mud] changes to draft-richardson-opsawg-mud-iot-dns-considerations-03.txt
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tirumal reddy <kondtir@gmail.com> wrote:
    >> tirumal reddy <kondtir@gmail.com> wrote:
    >> > +1.  The problem is not just with public resolvers but also with
    >> > designated resolvers. The IoT device supporting MUD must use the
    >> > encrypted DNS server discovered in the attached network.
    >>
    >> Yes-ish.
    >>
    >> I don't think that we have to mandate use of encrypted DNS servers,
    >> as long as it's the ones on the attached network.
    >>

    > In the home network use case, if the CPE does not support an encrypted DNS
    > forwarder, endpoint will discover and use the ISP encrypted DNS recursive
    > server. The CPE will no longer be able to enforce MUD rules. For instance,
    > Firefox can discover and use Comcast Encrypted DNS recursive server, see
    > https://tools.ietf.org/id/draft-rescorla-doh-cdisco-00.html.

It's reasonable that Firefox might do that, but I don't see why IoT devices
should follow suit, and that's the point of this document.

Except in some very niche digital signage and kiosk use, I don't think a MUD
file would be appropriate for a general-purpose browser.

--
Michael Richardson <mcr+IETF@sandelman.ca>   . o O ( IPv6 IøT consulting )
           Sandelman Software Works Inc, Ottawa and Worldwide