Re: [IPv6] Working Group Last Call for <draft-ietf-6man-pio-pflag>

On Fri, Apr 5, 2024 at 9:49 AM Brian E Carpenter
<brian.e.carpenter@gmail.com> wrote:
> One minor comment: The whole draft, including the "Host Behaviour" section, assumes without stating it that the host contains an active DHCPv6 client. This is only a SHOULD in BCP220 (https://www.rfc-editor.org/rfc/rfc8504.html#section-6.5). This should be mentioned somehow - e.g. a statement in the Introduction that the mechanism is only applicable to hosts that implement that SHOULD.

Good point, I guess it's a common assumption that behavior specified
in the standard is only required/expected from a node which
implements/supports that standard ;)

I guess we can say that if the client does not support DHCPv6-PD then
it MUST ignore the flag (as per RFC4861, see below).

> Theoretically, an operator might encounter hosts that don't support DHCPv6 at all and will blindly use SLAAC. Presumably, such hosts will silently ignore the P flag, but I can't see any text in RFC4861 about handling unknown flags.

https://datatracker.ietf.org/doc/html/rfc4861#section-4.6.2
says that Reserved field MUST be initialized to zero by the sender and
MUST be ignored by the receiver

so hosts which do not yet support the P-flag draft MUST just ignore the flag.

> On 05-Apr-24 09:48, Bob Hinden wrote:
> > This message starts a new two week 6MAN Working Group Last Call on
> > advancing:
> >
> >    Title:   Signalling DHCPv6 Prefix Delegation Availability to Hosts
> >    Authors: Lorenzo Colitti
> >             Jen Linkova
> >             Xiao Ma
> >             David 'equinox' Lamparter
> >    Name:    draft-ietf-6man-pio-pflag-02.txt
> >    Pages:   13
> >    Dates:   2024-03-21
> >
> >    https://datatracker.ietf.org/doc/html/draft-ietf-6man-pio-pflag-02
> >
> > as a Standards Track document.
> >
> > Substantive comments and statements of support for publishing this
> > document should be directed to the ipv6@ietf.org mailing list.
> >
> > Editorial suggestions should be sent to the authors.
> >
> > This last call will end on April 18 2024, 23:00 UTC.
> >
> > Bob & Ole
> > 6man chairs
> >
> >
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> > ipv6@ietf.org
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-- 
Cheers, Jen Linkova