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

[Eric Rescorla <[e-mail]>]

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

-Ekr