Re: new draft on IPv6 CPE router available for review

[Shin Miyakawa <miyakawa@nttv6.jp>]

Hello,

I have a comment on the transfered message by Wes,

> From: Mikael Abrahamsson [mailto:swmike@swm.pp.se] 
>
>
> In section 5.3 I would definitely like a CPE to work without having a
> WAN address (link local only). 

Actually, this does not work if a CPE use the strong host model implementation
describing in RFC1122 or STD3 : Requirements for Internet Hosts - Communication Layers.

> The rationale behind this is that we would like ISP routers have IPs 
> in a core IP-range (which will be protected from DDOS by ratelimiters or filters) 
> and have customers in their own IP space. 
> The handoff between distribution and CPE should be
> done via something that is not reachable from the internet, ie the CPE
> should never source packets from its WAN IP, instead it should source
> packets destined to the internet from a loopback IP which it should
> allocate to itself from DHCPv6-PD (it could also be a LAN interface IP).
> So behavior would be "get link-local working, do DHCPv6-PD, allocate IP
> to itself from PD range, then use THAT to provision itself further and
> to communicate with everything".

Originally, when we wrote RFC4241 (A Model of IPv6/IPv4 Dual Stack Internet 
Access Service) to start our IPv6/v4 dual stack native ADSL service, 
we also thought about same thing. So we can understand Mikael's will too.

But now Microsoft Vista and Windows 2008 IPv6 implementation are based on 
the strong host model as default, (please see 
http://technet.microsoft.com/en-us/library/bb878108.aspx
and
http://technet.microsoft.com/en-us/magazine/cc137807.aspx ).

Especially, if we think that the uplink is a "softwire" or the CPE is a brige,
Vista is one of the most likely to be used operating systems 
to terminate the IPv6 uplink by itself, so 
from practical point of view, we strongly recommend to assign a global IPv6 address.

We've just submitted a very short draft regarding this issue

http://www.ietf.org/internet-drafts/draft-miyakawa-1plus64s-00.txt

and hope this could be merged to the section 5.3 of Wes's draft with its reasons.

Best regards,

Shin Miyakawa, Ph.D
Director, Core Network Technology Team, Network Systems and Technologies, 
Innovative IP Architecture Center /
Corporate Planning Department (concurrent position)
NTT Communications Corporation
Tokyo Opera City Tower 21st Floor
3-20-2 Nishi-Shinjuku, Shinjuku-Ku, Tokyo, Japan 163-1421
E-mail:miyakawa@nttv6.jp / shin.miyakawa@ntt.com / miyakawa@wide.ad.jp
TEL:+81-3-6800-3262 / FAX:+81-3-5365-2990
Visiting Researcher, SFC Lab. KEIO University
WIDE Project