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Re: IPv6 RA vs DHCPv6 - The chosen one?
From: Joel jaeggli <joelja () bogus com>
Date: Sat, 24 Dec 2011 15:42:00 -0800

On 12/24/11 15:33 , Masataka Ohta wrote:
Karl Auer wrote:

Not necessarily. You can use ARP and DHCPv6 and you don't have
to waste time and power for DAD.

IPv6 does not do ARP, it does ND.

First of all, ND use is optional and, if ND is used, RA
must be used.

It means that, if RA is not used, ND can't be used.

Finding and maintaining the l2 address for a device on a subnet where RA
is not used is a pretty common activity so I'm not sure how your would
conclude that. 2461/4861/5942 certainly don't preclude that.

Then, the only reasonable protocol for address resolution
is ARP.

Even if you use DHCv6, you still need
ND. DAD is still performed on addresses assigned via DHCPv6.

That is a requirement by SLAAC because SLAAC has distributed
states, which can be inconsistent.

If RA is not used, there is no such requirement.

                                              Masataka Ohta




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