>> 
>> %       I think:
>> %       - it should be okay to deploy AAAA records to certain degree
>> %       - we need to be very conservative about deplying A6 records,
>> %         as A6 presents highly different behavior than A/AAAA records.
>> %         # of queries would increase, # of additoinal records would
>> %         go skyrocket.
>I think it was recognized a long time ago that the initial deployment
>of A6 records should be limited to two (or at most 3) levels. The question
>is whether that is enough to avoid the horrors described by Dan Bernstein 
>over on IPNG.

        I see... it is unfortunate RFC2874 does not cover it.
        it has A6 reference from leaf customer A6 record to ISP A6 record,
        and 5 levels of indirection.

itojun

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