> A authoritative server that only has AAAA entries and
> is asked for an A6 record MUST NOT synthesize A6 records
> from the AAAA ones. There is no restriction on populating both
> types, but it is strongly recommended against, and in such a case,
> both RRsets MUST be identical.
This proposal does not formally define equivalence of AAAA and A6.
is this limited to zero-prefix A6, or does it include A6's with
non-zero prefixes which just happen to resolve to the same thing?
Based on Rob's "zero prefix A6 is equivalent to AAAA" slide, I assume
the former..
> If a query does not contain EDNS indicator, then any IPv6 addresses
> contain in additional data section MUST be AAAA.
>
> Root and TLD zones MUST only contain A6 with prefix of 0.
Following the "prohibit on primary load, grumble on secondary load,
allow through on cached queries" interpretation of the "be
conservative in what you send, and liberal in what you accept"
principle, I also assume that the "MUST"s on zone contents should be
be enforced only when loading a primary..
- Bill
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