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

tirumal reddy <kondtir@gmail.com> Fri, 26 June 2020 07:38 UTC

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From: tirumal reddy <kondtir@gmail.com>
Date: Fri, 26 Jun 2020 13:08:13 +0530
Message-ID: <CAFpG3gc6Z2OcKWW7UKuRizyHJXT2WO0pd9J-S+cXSemCD7Cpzg@mail.gmail.com>
To: Eric Rescorla <ekr@rtfm.com>
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Subject: Re: [Add] Draft Posting: CNAME Discovery of Local DoH Resolvers
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On Thu, 25 Jun 2020 at 19:36, Eric Rescorla <ekr@rtfm.com> wrote:

> Hi folks,
>
> As has been noted previously, the current Firefox DoH/TRR design
> bypasses the ISP resolver even if the ISP resolver supports DoH.
>
> I have just posted draft-rescorla-doh-cdisco-00, which describes a
> CNAME-based mechanism for discovering when a local resolver supports
> DoH/TRR. Firefox can then determine whether that resolver is on the
> TRR list and if so can use it in preference to generic resolver.. The
> use of CNAME was chosen for pragmatic reasons (laid out in the draft).
> We're studying other designs but thought it would be a good idea
> to document this one.
>
> See: https://www.ietf.org/internet-drafts/draft-rescorla-doh-cdisco-00.txt
>

    2.  Some consumer-grade middleboxes (e.g., WiFI routers) may block
        unknown RRTypes.  The data here is quite old and limited, but
        still not particularly promising.


Now-a-days several security vendors are offering security services in home
networks (co-located on the home router or on a seperate device). McAfee
security service co-located on Home routers does not block unknown RRTypes.

-Tiru


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> -Ekr
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