Re: IPv6 support by wifi systems

[Karl Auer <kauer () biplane com au>]

On Tue, 2013-02-12 at 16:29 -0500, Brandon Ross wrote:
> It seems that, then, 
> MLD snooping is valuable as it will prevent DAD and other ND traffic from 
> using bandwidth towards hosts not in that group.

It will prevent *all* multicast traffic from using bandwidth towards
hosts not in the multicast groups involved. ND, DAD etc are just
specific cases.

> Other than solicited node multicast, is MLD used anywhere else in a 
> network that does not have layer 3 multicast enabled on a router?

MLD is used for all multicast - so a DHCPv6 packet, for example, will
only go to any relays and servers in the subnet. *Any* multicast will be
limited to its listeners. The only multicast that will go to all nodes
will be multicast sent to the "all link-local nodes" address - and even
that will not go to non-IPv6 nodes.

MLD snooping happens on switches - you will get the benefit even if in
an isolated network (no router at all).

Regards, K.

-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Karl Auer (kauer () biplane com au)
http://www.biplane.com.au/kauer
http://www.biplane.com.au/blog

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