Re: Additional Documentation Prefixes (was Re: AD Evaluation : draft-ietf-6man-ra-pref64-06)

Brian E Carpenter <brian.e.carpenter@gmail.com> Sun, 03 November 2019 19:32 UTC

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Subject: Re: Additional Documentation Prefixes (was Re: AD Evaluation : draft-ietf-6man-ra-pref64-06)
To: Michael Richardson <mcr+ietf@sandelman.ca>, Suresh Krishnan <Suresh@kaloom.com>
Cc: IETF IPv6 Mailing List <ipv6@ietf.org>
References: <F1B31C38-7CDB-4057-A573-D6AF76B264D3@kaloom.com> <CAKD1Yr1vOqTvEsv0oCm+bu7CkFwiyFv8_G1XM+4JAKYLoA21aA@mail.gmail.com> <27802.1572732078@localhost> <F95A29A5-CEAF-4A23-A678-C5465B248E42@kaloom.com> <24180.1572801507@localhost>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Date: Mon, 4 Nov 2019 08:32:39 +1300
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On 04-Nov-19 06:18, Michael Richardson wrote:
> 
> Suresh Krishnan <Suresh@kaloom.com>; wrote:
...
>     >> I'd also like to have three or four additional IPv6 documentation prefixes,
>     >> plus some documentation space from ULA-R and ULA-C.
> 
>     > What is ULA-R? Did you mean ULA-L? If so, it would be a pain to reserve
>     > something now since we also need to update RFC4193 to make sure that
>     > the Random “Global ID”s will not collide with the reserved prefixes. If
>     > ULA-C does take off, this would be a good idea to do something like
>     > this.
> 
> I guess L=1 is why you call it ULA-L. I have known it as ULA-Random.
> We are both talking about RFC4193 though.  So such a document would need to
> update RFC4193.

I think this is a bad and pointless idea. Pointless because it is 100% OK
to use any RFC4193 prefix as an example, since by definition it will never
be used on the Internet, and the chance of collision on a given ULA site
is 1 in 2**40 (and who cares anyway?). Bad because it means that millions
of existing boxes that can generate ULA prefixes would be non-conformant
and, seriously, is any vendor going to update date their firmware for this?

Regards,
   Brian