IPv6 /64 links (was Re: ipv6 book recommendations?)

Thu Jun 7 22:14:59 UTC 2012

On Thu, 2012-06-07 at 21:07 +0000, Dave Hart wrote:
> Bzzt.  With ARP, every IPv4 node on the link indicates each ARP packet
> to the OS.  With ND, only those nodes sharing the same last 24 bits of
> the IPv6 address indicate the packet up the stack.  The rest of the
> IPv6 nodes filter the multicast in the NIC.

Still not quite correct :-)

The "filtering" is done by a MLD-aware switch, which will send multicast
packets only to nodes that are listening to the appropriate multicast
group. The filtering you describe is pretty much what ARP does - ALL
nodes receive the packet, all but one ignore it. It depends on the
platform whether the CPU that does the ignoring is just in the NIC or is
in the node itself.

Regards, K.

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

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