[dhcwg] Re: New draft: DHCPv6 Recommended IPv6 Address Opt ion

Not commenting on draft … just FYI that DHC is not meeting at Madrid IETF. We had a call for topics a while back and got no responses.

- Bernie

On Jul 3, 2025, at 3:46 PM, Erik Nygren <[email protected]> wrote:



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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