Re: Non routable IPv6 registry proposal

John Levine <johnl@taugh.com> Wed, 20 January 2021 21:10 UTC

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Date: 20 Jan 2021 16:10:46 -0500
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From: "John Levine" <johnl@taugh.com>
To: ietf@ietf.org
Cc: phill@hallambaker.com
Subject: Re: Non routable IPv6 registry proposal
In-Reply-To: <CAMm+LwjNiE0P7RAVqzKMypNbh3=9BeqiWn_hGv3E=zX7-YmSXQ@mail.gmail.com>
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In article <CAMm+LwjNiE0P7RAVqzKMypNbh3=9BeqiWn_hGv3E=zX7-YmSXQ@mail.gmail.com> you write:
>The proposal is to reserve a significant block of IPv6 space (e.g.
>2002::/16) as non routable address space to be allocated in Class A/B/C
>sized chunks on a permanent basis either through random assignment or by a
>new registrar TBD for a negligible one-time fee ($0.10 or less). This would
>provide significant operational benefits for large enterprises managing
>complex networks.

This sounds a lot like ULAs. You generate a 40 bit random number,
prefix it with FD and that's your own /48. If you have a decent random
number genarator the chances of your 40 bit number colliding with
anyone else's are insignificant.  See RFC 4193.

I gather the problem in practice is that rather than a 40 bit random
number, too many people use one that spells something cute or
memorable in hex.

R's,
John

PS: The ULAs on my network are in fde3:783e:127d::/48.