[147881] in North American Network Operators' Group
Re: IPv6 RA vs DHCPv6 - The chosen one?
daemon@ATHENA.MIT.EDU (Karl Auer)
Sat Dec 24 06:06:40 2011
From: Karl Auer <kauer@biplane.com.au>
To: nanog@nanog.org
In-Reply-To: <4EF59438.8040505@necom830.hpcl.titech.ac.jp>
Date: Sat, 24 Dec 2011 22:05:31 +1100
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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On Sat, 2011-12-24 at 17:58 +0900, Masataka Ohta 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. Even if you use DHCv6, you still need
ND. DAD is still performed on addresses assigned via DHCPv6.
> DHCPv6 (and ARP) uses a lot less multicast/broadcast than ND.
ARP uses no multicast at all. However, ARP is an IPv4 protocol, not an
IPv6 protocol.
DHCPv6 uses multicast a lot - *every* client message is multicast. Relay
messages to servers are multicast by default (though it seems most
actual deployments configure the relays to use unicast).
Regards, K.
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Karl Auer (kauer@biplane.com.au) +61-2-64957160 (h)
http://www.biplane.com.au/kauer/ +61-428-957160 (mob)
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