Re: network's architecture under IPv6
On Fri, Feb 21, 2003 at 03:06:37PM -0500, Anthony DeRobertis wrote:
> Isn't neighbor discovery multicast, not broadcast, so it only goes to
> some hosts on the subnet? A fairly small number of them?
Yes, Neighbour and Router Discovery uses Multicast in a special multicast
group partitioned by the last 32bits of the requested address. Unless you
have clever switches, this only means the host stacks have less to process,
still all the NIC get the multicast message.
Good description is here: http://www.ngnet.it/e/ipv6proto/ipv6-proto-6.php
ND is clever in using normal communication packages to limit the amount of
ND messages for Address Resolution, Duplicate Detection and Neighbor
Unreachability discovery. Basically it sends the more messages the more it
is suspicious of having a died neighbour.
See Chapter 4 in the above url for differences. There are some (like Router
Discovery does not need an extra arp request)
Greetings
Bernd
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