Hi, Masataka. Thanks for your comments, inline.

> -----Original Message-----
> From: dnsop-boun...@ietf.org [mailto:dnsop-boun...@ietf.org] On Behalf Of
> Masataka Ohta
> Sent: Thursday, August 18, 2011 8:00 AM
> To: Leo Liu(bing)
> Cc: dnsop@ietf.org; re...@ietf.org
> Subject: Re: [DNSOP] Dynamic DNS Update Deployment??
> 
> Leo Liu(bing) wrote:
> 
> > Not homework, but contribution to the 6renum WG : )
> > DDNS is an important topic in renumbering.
> 
> A problem is that IPv6 is unimportant mostly because of lack of
> proper multihoming support which could have limited routing table
> growth, which was why renumbering was necessary. But, it's too
> late.
> 

Yes, there have been some people even argued " No multihoming, no IPv6". But 
the driven force of IPv6 deployment will strengthen more and more. If it is 
already late, then we couldn't wait anymore to do the necessary work :)

> Ted Lemon wrote:
> 
>  > Okay, this helps me to see where you were coming from with
>  > your other point about garbage in, garbage out.
> 
> In short, the garbage is SLAAC, which is not even stateless.
> 
>  > The case where you'd want to use DHCP is the case where
>  > non-server hosts are being renumbered.
> 
> Automatic renumbering is most useful for site-wide renumbering
> with provider changes.

Provider change is just a typical renumbering scenario. Any other scenarios 
such as new added uplink, internal network re-organization .etc, which cause 
large amount of hosts to change the address configurations would benefit very 
much from automatic renumbering process. 

> 
> Of course, the most difficult part is renumbering of glue,
> which is solvable but ignored in this thread.

Yes. How to systematically manage and update things like manually configured or 
deeply embedded addresses is a big challenge.

> 
>                                               Masataka Ohta
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