[v6ops] Re: [dhcwg] Re: Re: [IPv6]Re: Android now supports DHCPv6 PD

[Lorenzo Colitti <[e-mail]>]

FWIW a university campus network seems like a great use case for DHCPv6 PD.
It's very similar to a mobile network in that it provides access to large
numbers of unmanaged devices. Per-device subnets (either using PD or using
RAs as described in RFC 8273) should make it easy to support large numbers
of devices without scaling issues and should make it easier to defend
against on-link ND attacks.

Speaking of the address policy specifically, the wording in the current
policy seems to ban RFC 8273 as well, since in RFC 8273 the network
provides a /64 prefix for every device - it just uses RAs to do so instead
of PD.

On Wed, Sep 17, 2025 at 11:41 PM Tim Chown <[e-mail]> wrote:

> On 17/09/2025, 01:36, "Lorenzo Colitti" <[e-mail]> wrote:
>
>
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> On Wed, 17 Sept 2025, 09:17 Mark Smith, <[e-mail]> wrote:
>
> If but anyone had warned of this outcome before.
>
>
>
> If you're worried about IPv6 address space running out, you might want to
> have a look at the original IPv6 proposal in RFC 8507, which proposed a 64
> bit address space.
>
>
>
> There's no need to look at history here. We can just observe that all
> cellular networks assign two or more /64s to every device by default, all
> the time. That is the industry standard and was strongly argued for by the
> IETF when mobile operators originally designed the standards to assign only
> a single /128 per device.
>
>
>
> Why RIPE would have a policy that allows cellular networks to provide
> multiple /64s per device but doesn't allow, say, enterprise networks to do
> the same seems somewhat arbitrary and unfair. After all, both of these are
> IETF-standard deployment models.
>
>
>
> Well, “RIPE” is just a community of people, that could redefine/clarify
> that policy to reflect modern reality.
>
>
>
> As an NREN advocating campuses deploy IPv6, we have to justify giving more
> than a /48 to an organisation, and if DHCP-PD isn’t acceptable then those
> organisations will need to look at LIR status.  That’s not currently an
> expensive proposition, in the grand scheme of university finances.  An NREN
> can route such LIR space alongside assignments from its own space, as we do.
>
>
>
> Tim
>