[manet] Re: [Autoconf] Fwd: I-D ACTION:draft-chakeres-manet-iana-00.txt

[Christophe Jelger <Christophe.Jelger at unibas.ch>]

Ian/all,

I didn't attend the last ietf meeting so I don't know how this topic was 
discussed but I remember we had a similar discussion in March 2005 and 
the consensus (March 17th 2005) was that there should be a multicast 
address for each MANET routing protocol as done with existing routing 
protocols (e.g. ff02::5 and ff02::6 for OSPF, ff02::9 for RIP, ff02::d 
for PIM).

One argument was to be consistent with current practices, and another 
argument was that we already have ff02::1 (all nodes) and ff02::2 (all 
routers) so it was not clear why we should have an extra 
"all_manet_routers" address (especially if we have a multicast address 
for each manet routing protocol). Also having a different multicast 
address for each manet routing protocol prevents a node that does not 
run a given routing protocol to process packets associated to it: it 
will not even receive them at the MAC layer.

So I'm rather in favor of having for example ff02::DYMO and 
ff02::OLSRv2, and if a larger scope is required we can instead have 
ff0x::DYMO and ff0x::OLSRv2. This implies that there would not be an 
all_manet_routers address. Now for address autoconfiguration, there 
could also be a dedicated multicast address ff0x::MANET-AUTOCONF.

regards,
Christophe

PS: note that the same reasoning applies to IPv4

Ian Chakeres wrote:
> Here is the draft I promised during MANET IETF 66 discussing MANET
> IANA considerations. It is meant to aid in discussing IANA assignments
> for MANET. I've broken down the different components into different
> sections.
>
> I think we are all in agreement in the immediate need for LL
> (link-local) MANET Routers multicast group.
>
> Less agreement, but definitely useful is a MANET UDP port.
>
> More discussion is needed for Scoped MANET Routers and any other
> scoped "host/node" multicast groups. Please comment on these. I would
> especially like some feedback from AUTOCONF people.
>
> Please email your comments to the lists or to me directly.
>
> Thanks.
> Ian Chakeres
>
> BTW: A document discussing MANET architecture should be coming out
> this week. Once it is posted I'll send an email also. The arch
> document may help in discussing the different IANA assignments.

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