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RE: Comments on draft-yourtchenko-colitti-nd-reduce-multicast

"Hemant Singh (shemant)" <shemant@cisco.com> Fri, 21 February 2014 21:27 UTC

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From: "Hemant Singh (shemant)" <shemant@cisco.com>
To: "Eric Levy- Abegnoli (elevyabe)" <elevyabe@cisco.com>, Ole Troan <otroan@employees.org>, Erik Nordmark <nordmark@acm.org>
Subject: RE: Comments on draft-yourtchenko-colitti-nd-reduce-multicast
Thread-Topic: Comments on draft-yourtchenko-colitti-nd-reduce-multicast
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Date: Fri, 21 Feb 2014 21:27:49 +0000
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Cc: "Andrew Yourtchenko (ayourtch)" <ayourtch@cisco.com>, 6man WG <ipv6@ietf.org>
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RFC 3315 came into being before RFC 4862.  RFC 4862 has a MUST clause for nodes to perform DAD for DHCPv6 addresses.  So shouldn't DHCPv6 clients comply with RFC 4862 for DAD behavior and ignore the SHOULD for performing DAD in RFC 3315?  This is the text from RFC 4862.

[Duplicate Address Detection MUST be performed on all unicast addresses prior to assigning them to an interface, regardless of whether they are obtained through stateless autoconfiguration, DHCPv6, or manual configuration,]

There is a set of exceptions to the above clause in RFC 4862 but those exceptions do not overrule what has been asked of DHCPv6 above for DAD. 

Hemant

-----Original Message-----
From: ipv6 [mailto:ipv6-bounces@ietf.org] On Behalf Of Eric Levy- Abegnoli (elevyabe)
Sent: Friday, February 21, 2014 9:19 AM
To: Ole Troan; Erik Nordmark
Cc: Andrew Yourtchenko (ayourtch); 6man WG
Subject: Re: Comments on draft-yourtchenko-colitti-nd-reduce-multicast

DHCP won't work without changes which would be a lot bigger that anything envisioned for ND address registration.

DHCP does not maintain link-locals. That would be a major change to fix that, including on hosts, since address requests are responded in unicast.
DHCP does not maintain <IP, MAC> binding. It does not have the MAC (not to confuse with DUID).
DHCP is not on the forwarding path where we need the information quickly Eric

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