RE: WPD-6, WAA-8, and WAA-9 of draft-ietf-v6ops-ipv6-cpe-router-04

["Wes Beebee (wbeebee)" <wbeebee@cisco.com>]

>>Dumb question. In an IPv6 world, we don't actually have unnumbered 
>>links; we have link-local-addressed links. The link do in fact have 
>>addresses, but they are not externally addressable/ddos-able. If you 
>>want to manage a router, you use its loop-back address, which is 
>>perhaps a ULA and therefore unroutable from neighboring (customer, 
>>upstream, or
>>peer) networks.
>>
>>Is there a problem with the link-local-address model if an ISP would =

>>rather use it?
>>
>>Or did I miss something?
>
>I've never seen a real definition of what 'unnumbered' is supposed to
mean in the context of IPv6, >but I think it is assumed to mean a link
that does not have a global prefix.

By unnumbered, we are referring to a link that only has a link-local
address and does not have a ULA or a global prefix.  All globally-routed
traffic sourced by this interface uses a global prefix assigned to a
different interface, and thus, the device uses the weak-host model,
since the strong-host model would forbid traffic with a source address
that doesn't match any address assigned to the source interface.

- Wes