Re: [dhcwg] I-D Action: draft-ietf-dhc-rfc3315bis-09.txt - questions about Solicit Prefix Delegation - src LL vs GUA

<mohamed.boucadair@orange.com> Wed, 15 November 2017 14:10 UTC

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From: <mohamed.boucadair@orange.com>
To: Ted Lemon <mellon@fugue.com>, "Templin, Fred L" <Fred.L.Templin@boeing.com>
CC: "dhcwg@ietf.org" <dhcwg@ietf.org>, Alexandre Petrescu <alexandre.petrescu@gmail.com>, "Bernie Volz (volz)" <volz@cisco.com>
Thread-Topic: [dhcwg] I-D Action: draft-ietf-dhc-rfc3315bis-09.txt - questions about Solicit Prefix Delegation - src LL vs GUA
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Date: Wed, 15 Nov 2017 14:10:16 +0000
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Subject: Re: [dhcwg] I-D Action: draft-ietf-dhc-rfc3315bis-09.txt - questions about Solicit Prefix Delegation - src LL vs GUA
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Hi Ted,

There are networks where the host gets first a /64, and then uses DHCP-PD to get a longer prefix (e.g., /56). You can refer to RFC 6603, for example.

It may be tempting for some to restrict prefix delegation only to hosts that are already assigned a /64 is such case (that is, assume that the solicit request will be from a GUA address), but I do personally think this will lead to troubles given that a host does not have a clear guidance on which address to pick.

Cheers,
Med

De : dhcwg [mailto:dhcwg-bounces@ietf.org] De la part de Ted Lemon
Envoyé : vendredi 20 octobre 2017 22:53
À : Templin, Fred L
Cc : dhcwg@ietf.org; Alexandre Petrescu; Bernie Volz (volz)
Objet : Re: [dhcwg] I-D Action: draft-ietf-dhc-rfc3315bis-09.txt - questions about Solicit Prefix Delegation - src LL vs GUA

On Oct 20, 2017, at 4:46 PM, Templin, Fred L <Fred.L.Templin@boeing.com<mailto:Fred.L.Templin@boeing.com>> wrote:
Sorry I am late to this discussion, but AERO uses link-local source address for
all DHCPv6 PD messaging. It works in the public domain implementations I
have been working with.

It's actually nonsensical to use some other address.   One of the purposes of DHCP is to get addresses, so if the server assumes you already have one, how's that going to work?