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

I think the confusion is related with having two models, e.g. 802.11 BSS/ESS
and IBSS. BSS/ESS has coordination function and the IP subnet model works
quite well. IBSS is also called ad-hoc mode.

With IBSS, fully mesh is not guaranteed. Here we use the MANET protocols for
end-to-end connectivity.

Now, the MANET protocols are evolved and can be used to connect nodes on
different segments, like classical IP routing protocols.

Maybe the two documents are describing the IBSS / ad-hoc mode. I agree on
adding text that there is a need for ad-hoc networking for the other mode
also. 
Just look at your desk and see the need for this;-)

Teco.

> -----Oorspronkelijk bericht-----
> Van: Alexandru Petrescu [mailto:alexandru.petrescu@gmail.com]
> Verzonden: dinsdag 20 november 2007 16:20
> Aan: autoconf@ietf.org
> Onderwerp: [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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