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

Suresh Krishnan <Suresh@kaloom.com> Mon, 04 November 2019 02:49 UTC

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From: Suresh Krishnan <Suresh@kaloom.com>
To: Brian E Carpenter <brian.e.carpenter@gmail.com>
CC: Michael Richardson <mcr+ietf@sandelman.ca>, IETF IPv6 Mailing List <ipv6@ietf.org>
Subject: Re: Additional Documentation Prefixes (was Re: AD Evaluation : draft-ietf-6man-ra-pref64-06)
Thread-Topic: Additional Documentation Prefixes (was Re: AD Evaluation : draft-ietf-6man-ra-pref64-06)
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Date: Mon, 4 Nov 2019 02:49:25 +0000
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> On Nov 3, 2019, at 2:32 PM, Brian E Carpenter <brian.e.carpenter@gmail.com>; wrote:
> 
> 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?

Agree with you Brian. That is why I called out the collision issue above.

Regards
Suresh