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

Brian E Carpenter <brian.e.carpenter@gmail.com> Sat, 13 February 2021 21:17 UTC

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To: Fernando Gont <fgont@si6networks.com>, David Farmer <farmer@umn.edu>, Fred Baker <fredbaker.ietf@gmail.com>
Cc: IPv6 Operations <v6ops@ietf.org>, "6man@ietf.org" <6man@ietf.org>
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From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Date: Sun, 14 Feb 2021 10:17:40 +1300
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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 13-Feb-21 22:19, Fernando Gont wrote:
...
> Well, whether we call it out or not, as per RFC4007:
> 
>                scope(LL) < scope(ULA) < scope(GUA)

And there's the fallacy. This inequality only makes sense if reachability is strictly a matter of concentric circles. It isn't. Nice math, but not reality.

Slide 4 of https://www.cs.auckland.ac.nz/~brian/scope6.pdf

   Brian