The basic problem is that neither the IPv6 community nor the DNS
community has reached a clear consensus on whether the extra features
of A6 over AAAA are worth the extra cost. That's not a euphemism for
"have decided that they're not", I really mean that we have people
advocating each side in each group and have not answered the question.
So we attempted to approach the question from the angle of "what does
IPv6 need the DNS to do?" Since that question also appears to be a
potential rathole, we tried to focus on the specific areas in which A6
would allow us to do things that can't be done with just AAAA and some
preprocessing during zone file generation.
All the cases we thought of that would justify A6 appeared to boil
down to situations where the DNS data would have to change so fast
that it isn't practical to update the DNS that quickly (eg, rapid
renumbering, or GSE-like routing).
So the question to the IPv6 WGs is: is IPv6 going to be doing these
things? If so, AAAA probably is not sufficient, and A6 may be the
answer. If not, AAAA may or may not be sufficient, but the new
features that A6 provides don't appear to be justified by IPv6's
requirements.
--------------------------------------------------------------------
IETF IPng Working Group Mailing List
IPng Home Page: http://playground.sun.com/ipng
FTP archive: ftp://playground.sun.com/pub/ipng
Direct all administrative requests to [EMAIL PROTECTED]
--------------------------------------------------------------------
