IPv6 RA vs DHCPv6 - The chosen one?

Masataka Ohta mohta at necom830.hpcl.titech.ac.jp
Sat Dec 24 08:58:32 UTC 2011

Michael Sinatra wrote:

>> DHCPv6 works over link layers with unreliable multicast
>> better than ND.
> You still need ND to provide the link-layer address resolution (i.e. the
> IPv6 equivalent of ARP), even with DHCPv6.

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

> Moreover, how do you come to
> the conclusion that DHCPv6, which uses multicast for the solicitation,
> is more reliable over links where multicast is unreliable?

DHCPv6 (and ARP) uses a lot less multicast/broadcast than ND.

> FYI, I have been using SLAAC over 802.11 for many years, and have
> supported large 802.11 installations with SLAAC and have never had a
> problem related to "unreliable multicast" on that medium. Other
> problems, yes.  But not that one.

That's because your 802.11 is not congested.

						Masataka Ohta

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