[IPv6]Re: Analysis of Ungleich ULA Registry

["Dale W. Carder" <[e-mail]>]

Thus spake David Farmer (farmer=[e-mail]) on Mon, May 27, 2024 at 11:18:08AM -0500:
> While the Ungleich ULA Registry demonstrates significant support for full
> registration, something like draft-hain-ipv6-ulac provides. My
> primary concern is a mechanism that allows for ULA prefixes shorter than
> /48 as a result of the practical restrictions of 10 ULA prefixes created by
> known-local ULA. I could accept a consensus to accomplish that through
> randomized local ULA assignments of ULA prefixes shorter than /48 instead
> of centralized ULA assignments. However, unfortunately, it is unclear to me
> that there is a consensus for either way forward.

I feel like I missed something, can you help explain where this number 
10 is coming from?

Dale


> On Thu, May 23, 2024 at 4:00 PM Kyle Rose <[e-mail]> wrote:
> 
> > FWIW, to try being constructive for a change, I might recommend the ULA-R
> > spec be updated to support prefixes as short as (say) /40, but to start
> > with a /48 and start shaving off bits from the end when more space is
> > needed, and to always start with 40 bits of randomness. And the update
> > should indicate in a table how much more likely collisions are with each
> > fewer bit.
> >
> > If we publish such an update, we can regard ULA-R prefixes as short as /40
> > within RIO or PIO fields as known-local. (My preference would be that any
> > prefix within fc00::/7 should be regarded as known-local for simplicity and
> > flexibility for operators, but evidently there's been push-back against
> > that proposal.)
> >
> > We could also loosen the guidance to allow anywhere between /40 and /64,
> > i.e., 32-56 bits of randomness, but I haven't really thought through the
> > implications of longer prefixes.
> >
> > Kyle
> >
> 
> 
> -- 
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