Re: [Snac] I-D Action: draft-ietf-snac-simple-00.txt

Right, MAY would be way too unspecific in that case. MAY basically says "we
aren't saying you shouldn't do this, nor that you mustn't do this." :)

So I think as you say that what we really need here is to be more specific
about exactly what "is available" means. So, perhaps:

If IPv6 prefix delegation and IPv6 service is both available on the
infrastructure link, then the stub  router MUST attempt to acquire a prefix
using IPv6 prefix delegation.

and

Therefore, when the stub router is able to successfully acquire a prefix
using DHCPv6-PD, it MUST use DHCPv6 PD rather than its own self-generated
ULA prefix.

On Tue, Feb 21, 2023 at 3:22 AM Esko Dijk <esko.dijk@iotconsultancy.nl>
wrote:

> What about the case where DHCPv6-PD is available, but the stub router
> doesn’t get the desired prefix length or encounters some error in the
> process?
>
> In that exceptional case it still MAY allocate a prefix out of its ULA
> prefix.
>
>
>
> Depending on the reader, “is available” and “works for me” can be
> different things.
>
>
>
> Esko
>
>
>
> *From:* Snac <snac-bounces@ietf.org> *On Behalf Of * Ted Lemon
> *Sent:* Monday, February 20, 2023 13:08
> *To:* Florian Obser <florian+ietf@narrans.de>
> *Cc:* snac@ietf.org
> *Subject:* Re: [Snac] I-D Action: draft-ietf-snac-simple-00.txt
>
>
>
> Yup, good catch. Thanks!
>
>
>
> On Mon, 20 Feb 2023 at 07:06, Florian Obser <florian+ietf@narrans.de>
> wrote:
>
>
> 5.2.2 states:
> |   If IPv6 prefix delegation is available, which implies that IPv6
> |   service is also available on the infrastructure link, then the stub
> |   router MAY use IPv6 prefix delegation to acquire a prefix to
> |   advertise on the stub network, rather than allocating one out of its
> |   ULA prefix.
>
> and 5.2.3:
> |   Therefore, when DHCPv6-PD is available, the stub router MUST use DHCPv6
> |   PD rather than its own prefix.
>
> That's contradictory, I suppose 5.2.2 should say:
> |   If IPv6 prefix delegation is available, which implies that IPv6
> |   service is also available on the infrastructure link, then the stub
> |   router MUST use IPv6 prefix delegation to acquire a prefix to
> |   advertise on the stub network, rather than allocating one out of its
> |   ULA prefix.
>
> Or maybe just drop the last paragraph from 5.2.2 entirely.
>
> --
> In my defence, I have been left unsupervised.
>
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>