[160782] in North American Network Operators' Group
Re: IPv6 support by wifi systems
daemon@ATHENA.MIT.EDU (Karl Auer)
Tue Feb 12 22:32:44 2013
From: Karl Auer <kauer@biplane.com.au>
To: NANOG List <nanog@nanog.org>
Date: Wed, 13 Feb 2013 14:32:22 +1100
In-Reply-To: <alpine.OSX.2.02.1302121611160.346@brugal.local>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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.
--
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Karl Auer (kauer@biplane.com.au)
http://www.biplane.com.au/kauer
http://www.biplane.com.au/blog
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