Re: [IPv6] I-D Action: draft-ietf-6man-rfc6724-update-07.txt

[David Farmer <[e-mail]>]

On Fri, Apr 5, 2024 at 3:55 PM Brian E Carpenter <
[e-mail]> wrote:

> On 06-Apr-24 09:15, David Farmer wrote:
> > On Fri, Apr 5, 2024 at 2:37 PM Brian E Carpenter <
> [e-mail] <mailto:[e-mail]>> wrote:
> >
> >     On 06-Apr-24 07:15, David Farmer wrote:
> >      > On Fri, Apr 5, 2024 at 9:30 AM Ted Lemon <[e-mail]
> <mailto:[e-mail]> <mailto:[e-mail] <mailto:
> [e-mail]>>> wrote:
> >     ...
> >      >     If constrained devices already support the policy table, I do
> not think this additional work is onerous.
> >      >
> >      >
> >      > How would the "known-local" ULA prefixes be populated if not
> dynamically updated from PIOs and RIOs?
> >
> >     By the simple fact that a host actually has a ULA. This is the
> approach I used in three different userland hacks:
> >
> >     https://github.com/becarpenter/misc/blob/main/enable_ula.py <
> https://github.com/becarpenter/misc/blob/main/enable_ula.py>
> >     https://github.com/becarpenter/misc/blob/main/gai_wrap.py <
> https://github.com/becarpenter/misc/blob/main/gai_wrap.py>
> >     https://github.com/becarpenter/getapr/ <
> https://github.com/becarpenter/getapr/>
> >
> >          Brian
> >
> >
> > That will work for a single ULA network, but how does that work when you
> merge ULA networks, as discussed in section 4.2 of RFC4193? Do all hosts
> have to get an address from the other network(s) to know they are local?
> Somehow, the host needs to know the other ULA networks to treat it as
> local; otherwise, effectively, you can't merge ULA networks as RFC4193
> promises. I envision that coming from ROIs. If not ROIs, what?
>
> Those would be rather strange RIOs, because they would announce a prefix
> that is in use in some other part of the network, not on the current LAN.
> In other words, RIOs with A=L=0 (as envisaged by RFC 8028, for a different
> purpose).
>
> I'm not disagreeing with you, but simply observing that in the simple
> case, we don't need to explictly rely on RIOs.
>

You are confusing RIOs and PIOs. PIOs have A and L flags, not RIOs. But
yes, I believe PIOs with A=L=0 should also be included.

Thanks

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