Re: Non routable IPv6 registry proposal

John R Levine <johnl@taugh.com> Thu, 21 January 2021 02:57 UTC

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Date: 20 Jan 2021 21:57:34 -0500
Message-ID: <114b7e98-9940-1386-89b2-2672cae12a76@taugh.com>
From: "John R Levine" <johnl@taugh.com>
To: "George Michaelson" <ggm@algebras.org>
Cc: "IETF general list" <ietf@ietf.org>
Subject: Re: Non routable IPv6 registry proposal
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References: <20210120211046.074FE6BC171B@ary.qy> <6794f7c4-7a37-7676-c245-d33a84384280@si6networks.com> <d4b56f13-b387-8663-81b3-38544ce9dcb2@taugh.com> <CAL9jLaaaOLtRDnEzffk5+rW9bJmcU+4p8hX+FRKMLzpRKaCDfA@mail.gmail.com> <CAKr6gn13Hvm=7VqKNnKO+55bz3Hs2n54uyzi19TCo4v8GS=LuA@mail.gmail.com>
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> and then.. decide to join. Now, tell me the risk of 1 in 220 things,
> both picking the same ULA, *AND* seeking to join their private
> networks.

That's much simpler -- that's the probability that two random 40 bit 
numbers are the same, which is one in 2^40.

For any plausible applications, the chances of two randomly chosen ULAs 
colliding in a way that matters, i.e., being routed on the same network, 
really is remote.

Regards,
John Levine, johnl@taugh.com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly