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

Ted Lemon <mellon@fugue.com> Sat, 13 February 2021 14:54 UTC

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From: Ted Lemon <mellon@fugue.com>
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Date: Sat, 13 Feb 2021 09:54:50 -0500
In-Reply-To: <a3fbfb94-90ae-961c-a2ab-33ade27e074e@si6networks.com>
Cc: David Farmer <farmer@umn.edu>, Fred Baker <fredbaker.ietf@gmail.com>, IPv6 Operations <v6ops@ietf.org>, "6man@ietf.org" <6man@ietf.org>
To: Fernando Gont <fgont@si6networks.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/v6ops/qDbJciUXvPkwh_BKn0p6_Q1cMNw>
Subject: Re: [v6ops] Scope of Unique Local IPv6 Unicast Addresses (Fwd: New Version Notification for draft-gont-6man-ipv6-ula-scope-00.txt)
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On Feb 13, 2021, at 4:19 AM, Fernando Gont <fgont@si6networks.com> wrote:
> Well, whether we call it out or not, as per RFC4007:
> 
>              scope(LL) < scope(ULA) < scope(GUA)
> 
> So it's more about acknowledging facts than about introducing or needing a new scope.  The same applies to the addresses you mentioned before.

No. scope(LL) < scope(ULA) and scope(LL) < scope(GUA) but scope(ULA) ? scope(GUA). That is, any particular ULA may or may not be global in scope.

The problem with admin scope is that it’s not a definitional scope, but rather an operational scope. Which may be the problem—we are using the term “scope” when that’s not specific enough—we could mean “by definition” or “in practice” scope, but we aren’t making that clear.  Of course, these are illustrative terms—I’m not saying we should switch to this terminology.

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