Re: A6/DNAME usage guidelines and limits

[Carl Perry <[e-mail]>]

On Tue, Apr 02, 2002 at 04:47:51PM +1000, Nathan Jones wrote:
> AAAA Synthesis
> 
>    [RFC2874] discusses making a transition from AAAA to A6 by automatically
>    generating AAAA records from A6 records. Such AAAA synthesis should be
>    viewed as an integral part of DNS support for IPv6, rather than purely
>    a transition mechanism. 
> 
>    A nameserver that offers recursive DNS resolution SHOULD be able to
>    generate AAAA records in response to AAAA queries. This allows devices
>    and other hosts to use a lightweight stub resolver that does not need
>    to know about A6.

I think this is the way to go.  A6 is a good idea, in general.  However,
having the resolver on a client have to perform multiple queries to get
a single name resolved is not a good idea.  End-points in the DNS tree
should be able to ask DNS server/cache systems to provide them an AAAA
answer to a name.  The server/cache should be able to handle AAAA and
A6, and convert A6 records to AAAA responses accordingly.  This gives
the ability for "easy" address renumeration, and a thinner client
resolver profile.  In short, it's the best of both worlds.

-- 
	-Carl Perry
	[e-mail]

"Deliver yesterday, code today, think tomorrow."