[Autoconf] Multicast confusion between MANET Arch and AUTOCONF Problem Statement

I think there may be a confusion with respect to the interpretation of
multicast in draft-ietf-autoconf-manetarch-07.txt vs
draft-ietf-autoconf-statement-02.txt.

It seems as if the manetarch accepts that link-layers have a well 
defined multicast behaviour whereas the problem statement doesn't.

autoconf-statement:
> Traditional solutions assume that a broadcast directly reaches every 
> router or host on the subnetwork, whereas this generally is not the 
> case in MANETs (see [2]).

So a broadcasted message (a special case of multicast) will not reach
every host on the MANET subnet.

[2] autoconf-manetarch:
> Link-local Multicast/Broadcast Scope On a MANET interface, a packet
> sent to a link-local multicast or all-ones broadcast address reaches
> the MANET interfaces of neighboring MANET routers...

So it actually does.

I personally think that the autoconf-manetarch definition is more inline
with how I see relationships between link-layer multicast and IP multicast.

Or maybe we could define 'subnet' to be a set of hosts and routers
linked together by the same link-layer technology where a multicast
behaviour is well defined.  Or similar?

What do you think?

Alex

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