D. J. Bernstein wrote:
<SNIP>
(1) NS records for which the parent node is in the zone,
(2) A records that those NS records point to,
(3) AAAA records that those NS records point to, or
(4) A6 records that those NS records point to.
<SNIP>
What happens if the IETF adds another address type beyond A/AAAA/A6?
Answer: a zone administrator who adds a record of that type causes a
complete zone-transfer failure with older versions of BIND 9. This is
even worse than the situation in http://cr.yp.to/djbdns/newtypes.html,
because it kills the whole zone transfer, not just the new records.
<SNIP>
Nobody would fall for
it if the document imposed rules relating to silly
experiments like A6.
Lots of snipps, just to remind you that A6 has been moved to
experimental
and that you won't find it in 99.9999% of current actively deployed
systems.
Check http://cr.yp.to/djbdns/killa6.html which you wrote some time ago
:)
Greets,
Jeroen