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

[Ole Troan <ot@cisco.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.

_iff_ you modeled your router as a host stack per interface with an internally routed network between the logical host stacks, you might pretend this is still the strong host model.

for the systems I know, what you describe is the weak host model.

again, can you please explain what problem you are trying to solve and how WPD-6 in the draft prohibits that?

/ot