Final Sigma (was: RE: Esszett, Final Sigma, ZWJ and ZWNJ)

[Patrik Fältström]

Do.....not.....go.....there....!

    Patrik

28 feb 2009 kl. 01.53 skrev John C Klensin <klensin at jck.com>:

>
>
> --On Saturday, February 28, 2009 10:44 +1100 Mark Andrews
> <Mark_Andrews at isc.org> wrote:
>
>>    You could get partial support the moment the type code was
>>    allocated.  Clients would query for the record.  Authoritative
>>    servers could use unknown type support to add the record.
>>    It would work for all names except those with CNAMEs.
>
> Excuse me?  How can one expect clients to "query for the record"
> before they, and the protocols they support, are updated?
> Remember that, as one moves out toward the stub resolvers, there
> are a lot of systems that haven't heard of RRSIG or even EDNS0
> and that will probably be updated only when their hardware rusts
> out.  You also said some things about the additional section --
> I assume that any required changes there would require software
> development and deployment.  Is that not correct?
>
>>    Support for CNAMEs requires servers and caches to be updated.
>
> And, of course, a decision that adding this type of information
> to CNAMEs is wise given that it is metadata and much closer to
> an ordinary RR than RRSIG is.
>
> Incidentally, no directionality indicator is needed: Bidi is
> complicated, but largely takes care of itself unless you have
> visions of right-to-left Latin strings.
>
>     john
>
>
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