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> Sun, 14 February 2021 22:38 UTC

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From: Ted Lemon <mellon@fugue.com>
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Date: Sun, 14 Feb 2021 17:38:30 -0500
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Cc: Brian E Carpenter <brian.e.carpenter@gmail.com>, Fernando Gont <fgont@si6networks.com>, IPv6 Operations <v6ops@ietf.org>, "6man@ietf.org" <6man@ietf.org>
To: David Farmer <farmer@umn.edu>
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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 14, 2021, at 4:54 PM, David Farmer <farmer@umn.edu> wrote:
> 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.

The problem is, then you have to say what “local” means, and it doesn’t mean anything specific. And, specifically, scope right now can be used as a definitional meaning. If you add “site scope,” it doesn’t work, because it’s no longer definitional—it’s operational. Trying to do the same thing with ULA will have the same outcome.