[dhcwg] New draft: DHCPv6 Recommended IPv6 Address Option

Following some discussions at past IETFs, I've created a -00 draft for a
new "DHCPv6 Recommended IPv6 Address Option".
Abstract:

   This document defines a new DHCPv6 option for communicating one or
   more recommended /128 IPv6 address to hosts within an assigned
   prefix.  The Recommended Address option allows DHCPv6 servers to
   suggest specific IPv6 addresses that hosts should additionally use
   when configuring addresses within the assigned prefix.

Github:
https://github.com/enygren/draft-nygren-dhc-recommended-ipv6-address
HTMLized:
https://datatracker.ietf.org/doc/html/draft-nygren-dhc-recommended-ipv6-address

The primary use-case for this is hosting, datacenter, and cloud
environments that want to assign a /64 per host but which also want to
ensure the host configures one or more addresses (such as for management
and running services).  Operators configuring servers in these environments
want to be able to ensure that a host will be available on a given /128
(for ssh'ing into, putting into DNS as a service endpoint, etc) while
DHCPv6-PD also means that the host is free to use the rest of the /64 for
its own purposes (eg, containers, K8s pods, temporary addresses, etc).

Using both IA_PD and IA_NA separately could also meet this use-case, but
would require multiple FIB entries or would effectively mean assigning a
/63 per host.  Using PD_EXCLUDE and then IA_NA within the PD_EXCLUDE prefix
was another alternative, but seems messier, more fragile, and outside my
understanding of the intent of PD_EXCLUDE.

I'd be happy to discuss in Madrid, either in hallways or presenting to the
DHC, v6ops, and/or 6man WG(s) if time is available.  It was suggested that
DHC would be the best venue to pursue this draft, but I'm open to
alternatives.

Best,

        Erik


---------- Forwarded message ---------
From: <[email protected]>
Date: Thu, Jul 3, 2025 at 3:26 PM
Subject: New Version Notification for
draft-nygren-dhc-recommended-ipv6-address-00.txt
To: Erik Nygren <[email protected]>


A new version of Internet-Draft
draft-nygren-dhc-recommended-ipv6-address-00.txt has been successfully
submitted by Erik Nygren and posted to the
IETF repository.

Name:     draft-nygren-dhc-recommended-ipv6-address
Revision: 00
Title:    DHCPv6 Recommended IPv6 Address Option
Date:     2025-07-03
Group:    Individual Submission
Pages:    8
URL:
https://www.ietf.org/archive/id/draft-nygren-dhc-recommended-ipv6-address-00.txt
Status:
https://datatracker.ietf.org/doc/draft-nygren-dhc-recommended-ipv6-address/
HTML:
https://www.ietf.org/archive/id/draft-nygren-dhc-recommended-ipv6-address-00.html
HTMLized:
https://datatracker.ietf.org/doc/html/draft-nygren-dhc-recommended-ipv6-address


Abstract:

   This document defines a new DHCPv6 option for communicating one or
   more recommended /128 IPv6 address to hosts within an assigned
   prefix.  The Recommended Address option allows DHCPv6 servers to
   suggest specific IPv6 addresses that hosts should additionally use
   when configuring addresses within the assigned prefix.



The IETF Secretariat

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