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

[Philip Homburg <pch-v6ops@u-1.phicoh.com>]

In your letter dated Wed, 7 Apr 2010 10:47:58 +0200 you wrote:
>in the following figure from the draft:
>
>                             |                             /
>                             | Customer                   /
>                             | Internet connection       /
>                          Wi |
>                      +------+--------+                  \
>                      |     IPv6      |                   \
>                      | Customer Edge |                    \
>                      |    Router     |                    /
>                      +---+-------+-+-+                   /
>          Network A       |       |   Network B          | End-User
>    ---+-------------+----+-    --+--+-------------+---  |network(s)
>       |             |               |             |      \
>   +----+-----+ +-----+----+     +----+-----+ +-----+----+  \
>   |IPv6 Host | |IPv6 Host |     | IPv6 Host| |IPv6 Host |  /
>   |          | |          |     |          | |          | /
>   +----------+ +-----+----+     +----------+ +----------+/
>
>you have a source S on the Internet sending to a destination D on =
>Network A. D does not exist on network A. you previously said you wanted =
>an ICMP error to use a source address giving most information about =
>where the problem occurred, i.e the IPv6 CE router's address on the =
>interface to network A.
>
>the ICMP error message will be sent back to S through interface Wi.
>
>the strong host model will require that the ICMP message is sent with an =
>address from Wi.
>the weak host model allows the use of a source address from the =
>interface connected to network A.

No. The interface attached to network A will generate the ICMP when 
neighbor discovery fails and will use its own IP address. It will then pass
the ICMP to the default router associated with interface A. Because the node
itself is a router, it can forward the packet internally and the packet will
probably leave over Wi.