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

[Brian E Carpenter <[e-mail]>]

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.

    Brian


> 
> Thanks
> -- 
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