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

Fernando Gont <fgont@si6networks.com> Mon, 15 February 2021 00:28 UTC

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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)
To: Brian E Carpenter <brian.e.carpenter@gmail.com>, Ted Lemon <mellon@fugue.com>
Cc: David Farmer <farmer@umn.edu>, Fred Baker <fredbaker.ietf@gmail.com>, IPv6 Operations <v6ops@ietf.org>, "6man@ietf.org" <6man@ietf.org>
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From: Fernando Gont <fgont@si6networks.com>
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Date: Sun, 14 Feb 2021 21:24:20 -0300
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On 14/2/21 19:40, Brian E Carpenter wrote:
> On 15-Feb-21 10:54, Fernando Gont wrote:
>> On 14/2/21 18:34, Ted Lemon wrote:
>>> On Feb 14, 2021, at 4:14 PM, Fernando Gont <fgont@si6networks.com
>>> <mailto:fgont@si6networks.com>> wrote:
>>>> That's not a legitimate use for GUAs.  Whereas in the case of ULAs,
>>>> that the *intended* usage.
>>>
>>> Untrue. ULAs are intended to be globally unique.
>>
>> Could you compute the birthday paradox for *all ULAs* on the internet,
>> and share the math/results?
> 
> I'm not Ted, and my preferred formulation is:
> 
>     ULAs are intended to be globally unique for all practical purposes.

FWIW, in that light, link-locals are also "globally-unique for all 
practical purposes" -- but we don't consider them global-scope.

-- 
Fernando Gont
SI6 Networks
e-mail: fgont@si6networks.com
PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492