[IPv6]Re: Analysis of Ungleich ULA Registry

David Farmer <farmer@umn.edu> Mon, 27 May 2024 16:18 UTC

Return-Path: <farmer@umn.edu>
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 A5E32C1CAF30 for <ipv6@ietfa.amsl.com>; Mon, 27 May 2024 09:18:34 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -4.395
X-Spam-Level:
X-Spam-Status: No, score=-4.395 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_ZEN_BLOCKED_OPENDNS=0.001, SPF_NONE=0.001, URIBL_DBL_BLOCKED_OPENDNS=0.001, URIBL_ZEN_BLOCKED_OPENDNS=0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=umn.edu
Received: from mail.ietf.org ([50.223.129.194]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zcIlCf6GjrQW for <ipv6@ietfa.amsl.com>; Mon, 27 May 2024 09:18:30 -0700 (PDT)
Received: from mta-p8.oit.umn.edu (mta-p8.oit.umn.edu [134.84.196.208]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 98F3FC1CAF41 for <ipv6@ietf.org>; Mon, 27 May 2024 09:18:28 -0700 (PDT)
Received: from localhost (unknown [127.0.0.1]) by mta-p8.oit.umn.edu (Postfix) with ESMTP id 4Vp16D137Gz9vBtg for <ipv6@ietf.org>; Mon, 27 May 2024 16:18:28 +0000 (UTC)
X-Virus-Scanned: amavisd-new at umn.edu
Received: from mta-p8.oit.umn.edu ([127.0.0.1]) by localhost (mta-p8.oit.umn.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id rLah9LTOaBQd for <ipv6@ietf.org>; Mon, 27 May 2024 11:18:28 -0500 (CDT)
Received: from mail-ej1-f72.google.com (mail-ej1-f72.google.com [209.85.218.72]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mta-p8.oit.umn.edu (Postfix) with ESMTPS id 4Vp16C5Rsxz9vBt3 for <ipv6@ietf.org>; Mon, 27 May 2024 11:18:27 -0500 (CDT)
DMARC-Filter: OpenDMARC Filter v1.3.2 mta-p8.oit.umn.edu 4Vp16C5Rsxz9vBt3
DKIM-Filter: OpenDKIM Filter v2.11.0 mta-p8.oit.umn.edu 4Vp16C5Rsxz9vBt3
Received: by mail-ej1-f72.google.com with SMTP id a640c23a62f3a-a6265d3cc76so154453666b.0 for <ipv6@ietf.org>; Mon, 27 May 2024 09:18:27 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=umn.edu; s=google; t=1716826705; x=1717431505; darn=ietf.org; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=LbSWzR/5zIL1Mo/tbD7Zs37lH1ebsp5J9716KMhN3lM=; b=cZlGQJ3mUOU+zrhnAAstFqa2BrBOIRnS3rl5P71JlpSsltHgQLYnanr4cCnuK8NwOf y3tzAZL8Uz1n+ncs7Ot7znQY7/mgbHKYttvwNlWA9RR/zIJZEalXQoURp3eA3Wzh6O7q 2WzMMwejxCFkuBVDZryFXFJkCGvh5a4A7PAjxHjmn1P1fYXxrpHVhyxYDyRCNaCXyjNl fgLWZ/K2ypqLSgdMoVXvXPohmQ7T1aYQn0Lm1+r0aF/T2EGSVELPcgZ2I9z17veI0BXb r+rFQ+ReR7qA79Wt/hRc6oOSwwKkCBLHyf5zUFFsgYYgLVhktCA7DO5tdt4UgMZxl4n/ YfsQ==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1716826705; x=1717431505; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=LbSWzR/5zIL1Mo/tbD7Zs37lH1ebsp5J9716KMhN3lM=; b=j+qVxjZEpAeJBPi4kgxVV07x3gqBnTQBLjbdgCgFoVmC61s2GW+fICrV7lVffJAQ1p VFS91pHzviM3ahOQGJC6Xr0m3vT+O4LRa+O4etABEixUNfVAoyeK01mzXihfGJjMbOir 06kRvs+6La5lFLvpGyWTCxKLEUQk+aF98cHZ6UTopnEeMtdNyy9BGWg14G21+B1GWTpP Iy5feFKSsxid5/y7OraNRrpLU5SvI/pl0vDSldVClec7sboDexq6w/QvJTRJwkRcffOw vwAwDU7hS2aOxE2jo+ZpxYgYDNY9jvXZPLn1uIm42bWOPn04cNxqsLKnn4YLtY4zXAud Lh9w==
X-Forwarded-Encrypted: i=1; AJvYcCU7M+kGMXfZAnafrky4fOspqG2yKjuhB/TLX59r357lBGQ3A6WyTbQGBKvlA2de1jAuaM7kVQIs73Eomm2G
X-Gm-Message-State: AOJu0YxyE7+MpqqYtOHNJnE8oH96h1jWXXNww36TdsRFUkV0eujLhdMh qKynOWlBCIRC2Six1hoO90r1Q4eOFuqbALf81sszN2wXVHJB5Nt8pstDNqYeY5bjWEGuW0gRTt0 Ytd2G3ny/ClZcOZJ0m49kdOTIisdg0OGSGXFlKXt/3tUNwX+uAv0fkkELUWbfKo9mDP3SZvC0Wn bADeycoL7sJqxjal0auVf0
X-Received: by 2002:a17:906:d9c4:b0:a62:9aad:6cb with SMTP id a640c23a62f3a-a629aad07fcmr468457666b.45.1716826705499; Mon, 27 May 2024 09:18:25 -0700 (PDT)
X-Google-Smtp-Source: AGHT+IHTeO3SvHD4EFvsGZFy99L/z90lk3vWbBM9GeIOWaSke4qMLqB8BeVg730aMDd8+oqcZwcZ5fKYFWL5+4OOAm0=
X-Received: by 2002:a17:906:d9c4:b0:a62:9aad:6cb with SMTP id a640c23a62f3a-a629aad07fcmr468455866b.45.1716826705049; Mon, 27 May 2024 09:18:25 -0700 (PDT)
MIME-Version: 1.0
References: <CAN-Dau0J1uqpwnRXYpeSFGUTJ532MmpeGd4BLoAqqf8HzeFTjQ@mail.gmail.com> <CAJU8_nW7Q3WphfgtgnK0E+88R1_nENCy9MBBYhG2G1bkPD9UeQ@mail.gmail.com> <CAN-Dau0Nc0VHMHdRg7MG6yf2X1S_SrYbA6YhKUzBz7XiLkR5cg@mail.gmail.com> <CAJU8_nX4O9hs6R6sOw2+iEL-7urcadNBdBsZfP3-Dn_yUFovLA@mail.gmail.com> <46c161b8-ca0d-4f18-ae3e-22fcb5befb0c@gmail.com> <CAKD1Yr3hTHy+p4nN1mkv4kHb907914gfyxnnzdexy6dYhNmiTw@mail.gmail.com> <7bcaaf7e-4564-4d76-9558-ab005aa70a30@gmail.com> <CAJU8_nUkO8mMY0GEZVj_nKN1f0bNxZwfv=oBKLtV6OgD86ZmAg@mail.gmail.com> <CAJU8_nUcE5ByxWRFEYLbPZtKuYPp0YMp-1jnEZhvJ5mcujyC6g@mail.gmail.com>
In-Reply-To: <CAJU8_nUcE5ByxWRFEYLbPZtKuYPp0YMp-1jnEZhvJ5mcujyC6g@mail.gmail.com>
From: David Farmer <farmer@umn.edu>
Date: Mon, 27 May 2024 11:18:08 -0500
Message-ID: <CAN-Dau08mUBWUZiBx1Fyx5Q6f5JQDmqZdgz9VYKMkVpKmEkB1Q@mail.gmail.com>
To: Kyle Rose <krose@krose.org>
Content-Type: multipart/alternative; boundary="000000000000e55239061971dd01"
Message-ID-Hash: 64E4NDPTFKTZO4ET2JN4757Y3NLRIVMW
X-Message-ID-Hash: 64E4NDPTFKTZO4ET2JN4757Y3NLRIVMW
X-MailFrom: farmer@umn.edu
X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-ipv6.ietf.org-0; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header
CC: 6man WG <ipv6@ietf.org>
X-Mailman-Version: 3.3.9rc4
Precedence: list
Subject: [IPv6]Re: Analysis of Ungleich ULA Registry
List-Id: "IPv6 Maintenance Working Group (6man)" <ipv6.ietf.org>
Archived-At: <https://mailarchive.ietf.org/arch/msg/ipv6/p79-QYrwXlej03qmT68lQLLmwE8>
List-Archive: <https://mailarchive.ietf.org/arch/browse/ipv6>
List-Help: <mailto:ipv6-request@ietf.org?subject=help>
List-Owner: <mailto:ipv6-owner@ietf.org>
List-Post: <mailto:ipv6@ietf.org>
List-Subscribe: <mailto:ipv6-join@ietf.org>
List-Unsubscribe: <mailto:ipv6-leave@ietf.org>

While the Ungleich ULA Registry demonstrates significant support for full
registration, something like draft-hain-ipv6-ulac provides. My
primary concern is a mechanism that allows for ULA prefixes shorter than
/48 as a result of the practical restrictions of 10 ULA prefixes created by
known-local ULA. I could accept a consensus to accomplish that through
randomized local ULA assignments of ULA prefixes shorter than /48 instead
of centralized ULA assignments. However, unfortunately, it is unclear to me
that there is a consensus for either way forward.

Thanks.

On Thu, May 23, 2024 at 4:00 PM Kyle Rose <krose@krose.org> wrote:

> FWIW, to try being constructive for a change, I might recommend the ULA-R
> spec be updated to support prefixes as short as (say) /40, but to start
> with a /48 and start shaving off bits from the end when more space is
> needed, and to always start with 40 bits of randomness. And the update
> should indicate in a table how much more likely collisions are with each
> fewer bit.
>
> If we publish such an update, we can regard ULA-R prefixes as short as /40
> within RIO or PIO fields as known-local. (My preference would be that any
> prefix within fc00::/7 should be regarded as known-local for simplicity and
> flexibility for operators, but evidently there's been push-back against
> that proposal.)
>
> We could also loosen the guidance to allow anywhere between /40 and /64,
> i.e., 32-56 bits of randomness, but I haven't really thought through the
> implications of longer prefixes.
>
> Kyle
>


-- 
===============================================
David Farmer               Email:farmer@umn.edu
Networking & Telecommunication Services
Office of Information Technology
University of Minnesota
2218 University Ave SE        Phone: 612-626-0815
Minneapolis, MN 55414-3029   Cell: 612-812-9952
===============================================