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

Michael Richardson <mcr+ietf@sandelman.ca> Sun, 03 November 2019 17:18 UTC

Return-Path: <mcr+ietf@sandelman.ca>
X-Original-To: ipv6@ietfa.amsl.com
Delivered-To: ipv6@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 32CBA12004A for <ipv6@ietfa.amsl.com>; Sun, 3 Nov 2019 09:18:31 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -4.2
X-Spam-Level:
X-Spam-Status: No, score=-4.2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id SIypfI-VSpeE for <ipv6@ietfa.amsl.com>; Sun, 3 Nov 2019 09:18:28 -0800 (PST)
Received: from tuna.sandelman.ca (tuna.sandelman.ca [IPv6:2607:f0b0:f:3:216:3eff:fe7c:d1f3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 68D83120018 for <ipv6@ietf.org>; Sun, 3 Nov 2019 09:18:28 -0800 (PST)
Received: from sandelman.ca (obiwan.sandelman.ca [IPv6:2607:f0b0:f:2::247]) by tuna.sandelman.ca (Postfix) with ESMTP id 2A95E3897A; Sun, 3 Nov 2019 12:15:36 -0500 (EST)
Received: from localhost (localhost [IPv6:::1]) by sandelman.ca (Postfix) with ESMTP id 0C478AAD; Sun, 3 Nov 2019 12:18:27 -0500 (EST)
From: Michael Richardson <mcr+ietf@sandelman.ca>
To: Suresh Krishnan <Suresh@kaloom.com>
cc: Lorenzo Colitti <lorenzo@google.com>, IETF IPv6 Mailing List <ipv6@ietf.org>
Subject: Re: Additional Documentation Prefixes (was Re: AD Evaluation : draft-ietf-6man-ra-pref64-06)
In-Reply-To: <F95A29A5-CEAF-4A23-A678-C5465B248E42@kaloom.com>
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>
X-Mailer: MH-E 8.6; nmh 1.7+dev; GNU Emacs 24.5.1
X-Face: $\n1pF)h^`}$H>Hk{L"x@)JS7<%Az}5RyS@k9X%29-lHB$Ti.V>2bi.~ehC0; <'$9xN5Ub# z!G,p`nR&p7Fz@^UXIn156S8.~^@MJ*mMsD7=QFeq%AL4m<nPbLgmtKK-5dC@#:k
MIME-Version: 1.0
Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha256; protocol="application/pgp-signature"
Date: Sun, 03 Nov 2019 12:18:27 -0500
Message-ID: <24180.1572801507@localhost>
Archived-At: <https://mailarchive.ietf.org/arch/msg/ipv6/E--uKex4QEaU4B_hRgAPoS-qgH0>
X-BeenThere: ipv6@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: "IPv6 Maintenance Working Group \(6man\)" <ipv6.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/ipv6>, <mailto:ipv6-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/ipv6/>
List-Post: <mailto:ipv6@ietf.org>
List-Help: <mailto:ipv6-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/ipv6>, <mailto:ipv6-request@ietf.org?subject=subscribe>
X-List-Received-Date: Sun, 03 Nov 2019 17:18:31 -0000

Suresh Krishnan <Suresh@kaloom.com>; wrote:
    >> I agree with you.
    >>
    >>> Is there a larger documentation prefix than 192.0.2.0/24?
    >>
    >> I wish that there was.

    > Me too. I also think a larger prefix could be useful. Similarly a block
    > that would differentiate it as an example of private space to be used.

    >> Maybe we could carve out of class E space as a /20 of documentation space.

    > Sounds like a plan. If you write something up, I would be willing to AD
    > sponsor something like this. The biggest issue with repurposing E space
    > was that it would hit a lot of bogon filters. In this case that is a
    > desirable feature.

Okay, I will write something if there is further support.
Should it update or replace RFC5737?

    >> 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'd like the IPv6 documentation prefixes to have a pretty high Hamming
    >> Distance from each other to maximize the visual distinction.

    > We have a /32 for this. Plenty of ways to be visually distinct
    > including some of the common ones I have used :-)

    > 2001:db8:abba::/48
    > 2001:db8:beef::/48
    > 2001:db8:cafe::/48
    > 2001:db8:dead::/48
    > 2001:db8:face::/48
    > 2001:db8:c001::/48

I'm not sure that I agree.
I don't see why we need to be so stingy about Documentation Prefixes in IPv6.
Using part of 3ffe::/16 would appeal to me.

--
Michael Richardson <mcr+IETF@sandelman.ca>;, Sandelman Software Works
 -= IPv6 IoT consulting =-