Re: [DNA] Question regarding prefix assignment

[Erik Nordmark <erik.nordmark@sun.com>]

Tero Kauppinen (JO/LMF) wrote:
> During the yesterday meeting it was brought up that using prefixes to 
> conclude whether a link has changed or not can be problematic in certain 
> cases. Can someone confirm whether the following scenario is possible or 
> not?
> 
>                Router(s) advertising
>                  prefixes A and B
>                         |
>                         |__________X_______ AP2
>                         |                  (may use only prefix A)
>                         |
>                         |
>                        AP1
>               (may use prefixes A and B)
> 
> X marks a box-in-the-middle e.g. a bridge (as mentioned yesterday).

I don't see how IPv6/ND can work in such a case, because the router and 
the other neighbors on the link would assume that address resolution 
(NS/NA) as well as IP packet delivery works transparently across the 
IEEE 802 LAN.
So I think this is a broken LAN.

    Erik