[manet] SMF in Manet and MPR

[Henning Rogge <[e-mail]>]

Hi,

I am reacting to the talk during the IETF meeting (chat didn't worked
for me for some reason).

My trouble with the MPR optimization for SMF (and a bit with SMF in
general) is that we currently have no good MPR algorithm for
heterogeneous Manet (Manet with multiple different types of radios).

The only described MPR algorithm (OLSRv2 appendix) works separately
for each interface... which means it always selects MPRs on long-range
(and slow) interfaces, which is really not what we want.

Of course there is also the problem that SMF completely ignores
routing metrics... and the problem that we lack a good dataplane for
SMF, which often results in horrible "raw socket trickery"...

So in general I would not suggest to people using SMF because I have
yet to find an use-case where SMF is doing well. Often an
application-specific forwarding strategy is much better than a generic
IP one in terms of multicast in Manet.

Henning Rogge