>>>>> "VD" == Viktor Dukhovni <[email protected]> writes:

VD> However, once "3 1 x" records are published, there is little point
VD> in publishing any other type of record.  So I am not sure about
VD> the "in addition to" bit.  Rather I would suggest "instead of".

The idea is that some seem to so wedded to pkix that they feel that they
MUST publish 0 or 1 if they publish tlsa at all.

(I obviously don't agree with that sentiment; and there is the
possiblity that those who do lost interest here and it may not ever be
an issue???)

Publish both is directed at them, to ease interoperability with any 7250
clients.

VD> Once the cost burden (on each server operator) of updating "3 1 x"
VD> records is present already, also publishing "2 1 X" just makes
VD> things needlessly complex.  There is no point.

I considered that issue even though I didn't call it out.  You're
right that it may lead type 2 users to choose between easy updates
and supporting 7250 clients.

That is part of why I'm only 'becoming convinced'.

VD> If the group believes that Postel's rule applies here, and that
VD> non-PKIX clients SHOULD always be willing to treat PKIX-EE(1) as
VD> DANE-EE(3), then we SHOULD add that to the text the OPS draft, and
VD> update the SMTP draft accordingly.

Postel's rule goes without writing; even when it isn't mentioned in
(potential) standards it remains proper for code to implment it.
But I would prefer to see it mentioned in the documents.

For a one-way authenticated sockect like tls often is, if the client can
create a trust path which /it/ likes, the server's pref doesn't matter.

Similarly, when the server authenticates the client, it is only the
server's choices about trust paths et alia which should matter to /it/.

-JimC
-- 
James Cloos <[email protected]>         OpenPGP: 0x997A9F17ED7DAEA6

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