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RE: RE: questions about draft-wen-ipv6-rsra-opt-multihoming-00

Could please I remind all of you in this particular mail thread that the charter of shim6 is to refine and develop one particular approach to multi-homing, and it is definitely NOT to rehash over the multi6 discussion of "all possible approaches to multihoming".
Accordingly, please think for a second about the relevance of your contribution to shim6 before including shim6 in your cc list. 

thanks,

  Geoff







At 03:38 PM 7/06/2006, CTO WEN Haibo wrote:

Hi Greg,

Please see the response below. Thanks.

Haibo

> -----Original Message-----
> From: Greg Daley [mailto:Greg.Daley@eng.monash.edu.au]
> Sent: 2006Äê6ÔÂ7ÈÕ 11:15
> To: CTO WEN Haibo
> Cc: Lawrence Zou; multi6@ops.ietf.org; shim6@psg.com
> Subject: Re: RE: questions about
> draft-wen-ipv6-rsra-opt-multihoming-00
>....
> > The core of this multi-homing information option is that to provide
> > someextra information along with prefix information option to help
> > host do
> > selection, and the host uses the prefix once it finds the matching
> > information in multi-homing information option.
> > ISP name is a sub-option, ISP name is a generalized name, the IPTV
> > service provider can name itself as "IPTV", Internet
> service provider
> > can name itself as "HSI", these names also indicates their service
> > type.Maybe I haven't made this very clear in the draft. Of course,
> > any other option can be also defined under this architecture, for
> > example, what
> > kind of service the isp can provide, the qos parameter, etc.
> > Currently,only a few suboption have been defined.
> >
> > Using this multi-homing option, router can priodically advertises
> > the
> > ISP's ability and related information.
> >
>
> I think it's a much better fit to provide this (changeable) operator
> related information using 802.21 media independent
> information services.
802.21 is developing standards to enable handover and interoperability between heterogeneous network types including both 802 and non 802 networks. 802.21 is running below IP layer. However, SAAC procedure is running in IP layer. 
You know, in multi-homing site, each router will advertise RA which contains
IPv6 prefix information, and the interface of host will receive all this RA. The 
standard Stateless Address Auto-Configuration doesn't provide extra
information to help prefix selection. Multi-homing informaiton option is for
this purpose.

>
> With respect to access network related configuration information,
> we already have DHCPv6 for that, and more specific route options
> for Router Discovery.
In IPv6, there are two ways for address auto-configuration, i.e., stateful
configuration based on DHCPv6, and stateless configuration. It seems there is
no standard that says only DHCPv6 can be used in access network and SAAC is forbidden. 

>
> Router Discovery is for prefix and next hop determination.  Let's not
> make it complicated for other reasons.
More information along with prefix information option in RA, will help host select the appropriate prefix to form its IPv6 global address and also select its exit router. It's not trying to make things complicated. Without this effort, host cannot 
find the appropriate prefix and exit router.