Re: [v6ops] Scope of Unique Local IPv6 Unicast Addresses (Fwd: New Version Notification for draft-gont-6man-ipv6-ula-scope-00.txt)

[David Farmer <[e-mail]>]

On Sun, Feb 14, 2021 at 3:32 PM Ted Lemon <[e-mail]> wrote:

> On Feb 14, 2021, at 4:00 PM, David Farmer <[e-mail]> wrote:
>
> So I recommend a small update to RFC4007, further quantify the necessary
> uniqueness;
>
> Global scope, for uniquely identifying interfaces anywhere in the Internet
> *or within the span of reachability for local-use addresses.*
>
>
> I think this whole discussion may have something to do with why site-local
> was deprecated, although I’m just guessing because I didn’t participate in
> that discussion.
>
> My question to you is this: how does your proposed update help anybody to
> understand?
>
> If we were to update the text, I would suggest something like this:
>
> Global scope, for uniquely identifying interfaces anywhere on the
> Internet. Note that when we say an address is “globally unique,” this is a
> definitional assertion: such an address is to be treated as globally unique
> by hosts and routers. Mechanisms for ensuring that this definitional
> assertion is not violated exist for each type of globally scoped address,
> and in some cases rather than ensuring that a globally /scoped/ address is
> in fact unique, these mechanisms ensure that the use of such addresses is
> constrained to contexts in which they are /known/ to be unique.
>
>
So when I read "uniquely identifying interfaces anywhere on the Internet",
that suggests to me the entirety of the Internet, basically anywhere and
everywhere, whether or not I can actually successfully get packets there or
not.  I think that statement needs to be qualified or limited by
reachability in some way. It doesn't need to specifically mention
local-use, but I think it clarifies the issue.  The fact that someone else
on the other side of the planet or even across the street is using the same
ULA prefixes as me doesn't really matter because I can't get packets there,
but that isn't that what that statement says.

Thanks
-- 
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David Farmer               Email:[e-mail]
Networking & Telecommunication Services
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