On Mon, Aug 10, 2015 at 10:43:56AM +0000, Pascal Thubert (pthubert) wrote:
> Yes it is. IP over Foo must indicate if IP multicast over a link uses L2
> mechanisms or not.
>
> If not, a router learns from MLD the state it needs to figure to which
> devices it should copy a given packet.
Well, the problem with WiFI is that L2 multicast are useful under some
conditions and not useful under others. And the conditions are more
complex than boolean ;-)
> For Wi-Fi, there is no multicast support and it is sufficiently clear now
> that relying on broadcast is not a good idea.
Pretty sure you don't mean that. If you would eliminate ALL multicast, you
didn't have discovery of new devices.
> Rather, a good idea could be to build a multilink subnet with APs that are
> also routers to serve the wireless edge, whereby the Ethernet backbone can
> rely on L2 broadcast while the wireless edge is routed. Many LLNs work like
> this. Why should Wi-Fi be an exception?
Thats why i asked what device model we need. Don't think i got an
answer for that though. L3 homenet APs would be lovely. But will it
be sufficient to ONLY support those theoretical devices in homenet ?
> > Again, if if's IPs problem then if 802.11 would just clearly state that
> > this is
> > the case, then we have a way forward. I just hope 802.11 understand that
> > it'll see a lot more unicast coming its way and be prepared to handle it.
>
> I'd hate this, IEEE telling IETF what to do. Just like IETF telling IEEE to
> do an immensely scalable L2 multicast support so that Solicited Node
> Multicast appears so cool on a switched fabric? Does not seem to work either.
Sure.
> The IETF has to decide if it wants to design IP over 802.11 - or Wi-Foo in
> general which would be my take. And then the IETF has to decide if it wants
> to design IP over a mix of Wi-Fi and Ethernet. IEEE people may join the
> effort so we do the job right.
Getting IPv6 link signaling work with WiFi sucking L2 multicast
is just a bit of work in the L2 IPv6 protocols that can be done
IMHO without botrhering IEEE. Getting streaming multicast work
best requires more L2 awareness and it doesn't seem homenet
is interested in thast anyhow, so i think we're only going to get
a solution for the L2 IPv6 signaling piece realistically in the
IETF alone.
Cheers
toerless
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