RE: CPE router draft: Default route and WAN interface provisioning

["Templin, Fred L" <Fred.L.Templin@boeing.com>]

Ole,

> -----Original Message-----
> From: owner-v6ops@ops.ietf.org [mailto:owner-v6ops@ops.ietf.org] On Behalf Of Ole Troan
> Sent: Wednesday, December 02, 2009 9:19 AM
> To: v6ops@ops.ietf.org
> Subject: CPE router draft: Default route and WAN interface provisioning
> 
> as the editor of the draft-ietf-v6ops-ipv6-cpe-router let me bring the following questions to the
> list.
> 
> the IPv6 CE router WAN interface needs to acquire addresses i.e behave like a host if one follows the
> definition in RFC4862. it forwards traffic out this interface so it is also a router.
> we don't want to redefine the host/router definitions in 4861/4862. for the purposes of address
> assignment of a router interface, is this text acceptable and clear:
> 
>    "When the router is attached to the WAN interface link it must act as
>    an IPv6 host for the purposes of stateless or stateful interface
>    address assignment ([RFC4862]/[RFC3315]).  The router acts as a
>    requesting router for the purposes of DHCP prefix delegation
>    ([RFC3633])."

Why does it need a non-link-local address on the WAN
interface? If it is going to act as a requesting router
in DHCP prefix delegation, it can get non-link-local
addresses to assign to its other interfaces.
 
> the IPv6 CE router also needs to set up routing. rfc3633 does not say anything about routing. there
> are multiple ways the IPv6 CE router's routing table could be set up. we're suggesting to include
> this requirement as a last resort catch to get a default route installed:
> 
>    "WPD-3:  Absent of other routing information the IPv6 CE router MUST
>            use Router Discovery as specified in [RFC4861] to discover a
>            default router and install a default route in its routing
>            table with the discovered router's adddress as the next-hop."
> 
> these are the last remaining issues we have with the CPE router draft before we'd like to publish a
> revision which I hope should be ready for WG last call.

If the IPv6 CE uses Router Discovery as specified in
[RFC4861], then it will send RS and any default routers
that hear it will set IsRouter to FALSE in the
corresponding neighbor cache entry.

Fred
fred.l.templin@boeing.com

> cheers,
> Ole
>