IPv6 RA vs DHCPv6 - The chosen one?

Masataka Ohta mohta at necom830.hpcl.titech.ac.jp
Sat Dec 24 23:33:03 UTC 2011

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.

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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