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

["CTO WEN Haibo" <Haibo.WEN@alcatel-sbell.com.cn>]

In addition, shim6 charter says: 
...
In addition to the network layer shim solution, the shim6 WG is
specifically chartered to work on:
o Solutions for site exit router selection that work when each ISP
uses ingress filtering, i.e. when the chosen site exit needs to
be related to the source address chosen by the host. This site
exit router selection and the associated address selection
process should work whether or not the peer site supports
the shim6 protocol.
...

Obviously, 802.21 couldn't solve the this kind of issue. Multi-homing option can 
solve the issue.


> -----Original Message-----
> From: CTO WEN Haibo 
> Sent: 2006年6月7日 13:38
> To: 'Greg Daley'
> Cc: Lawrence Zou; multi6@ops.ietf.org; shim6@psg.com
> Subject: RE: RE: questions about 
> draft-wen-ipv6-rsra-opt-multihoming-00
> 
> 
> Hi Greg,
> 
> Please see the response below. Thanks.
> 
> Haibo
> 
> > -----Original Message-----
> > From: Greg Daley [mailto:Greg.Daley@eng.monash.edu.au]
> > Sent: 2006年6月7日 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.
>