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

Thu Jun 7 21:07:31 UTC 2012

On Thu, Jun 7, 2012 at 8:42 PM, Ricky Beam <jfbeam at gmail.com> wrote:
> On Wed, 06 Jun 2012 17:17:37 -0400, Karl Auer <kauer at biplane.com.au> wrote:
>>
>> c) Similarly, ND (the direct equivalent of ARP) goes only to solicited
>> node multicast addresses, ARP goes to every node on the link.
>
> Effectively the same as broadcast in the IPv6 world.  If everyone is running
> IPv6, then everyone will see the packet. (things not running ipv6 can filter
> it out, but odds are it'll be put on the cable.)

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.

Cheers,
Dave Hart