IETF Logo Mail Archive

Re: [v6ops] Scope of Unique Local IPv6 Unicast Addresses (Fwd: New Version Notification for draft-gont-6man-ipv6-ula-scope-00.txt)

Ted Lemon <mellon@fugue.com> Fri, 12 February 2021 23:30 UTC

Return-Path: <mellon@fugue.com>
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 07D403A10D8 for <ipv6@ietfa.amsl.com>; Fri, 12 Feb 2021 15:30:05 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.898
X-Spam-Level:
X-Spam-Status: No, score=-1.898 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=fugue-com.20150623.gappssmtp.com
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 mpnPIc2J-NCE for <ipv6@ietfa.amsl.com>; Fri, 12 Feb 2021 15:30:04 -0800 (PST)
Received: from mail-qt1-x82e.google.com (mail-qt1-x82e.google.com [IPv6:2607:f8b0:4864:20::82e]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C0A1D3A1163 for <6man@ietf.org>; Fri, 12 Feb 2021 15:29:57 -0800 (PST)
Received: by mail-qt1-x82e.google.com with SMTP id b24so901170qtp.13 for <6man@ietf.org>; Fri, 12 Feb 2021 15:29:57 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fugue-com.20150623.gappssmtp.com; s=20150623; h=from:message-id:mime-version:subject:date:in-reply-to:cc:to :references; bh=kt+rMautOSHRWTdoP3zp7ymNIlXyHCKLRywW6EpCFZU=; b=0ZSQxvClsG+fgUMAN7T6casPu+s2WHnO+ia81S5GgvHFmbpGhcacVNg8erHP2/bkps mFhNpYDbmVCBqYa2vatjJvApuAMecj0tYRc7fvVcb0FYtRxsZAucMSMxxQy7blASeH1+ m/RHQ2ttD1e0hieSvyHadBJ8psrhon7ES/fw24lzfJlQ+UKaMpQ+UYhp7PFT0iY+HjOH BjOr6UUCyn52ft0u0lnEspmSssS037WJ3k1kj6WuvOu+uRP5cXIc+VOGlZAahsGdvOp4 5Dubs56NFwDJSwcdqFtrWAsB0D7hQLwPwysWTEArmys3H9fLqmqw50OzblCgAW75z4uA oivQ==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:message-id:mime-version:subject:date :in-reply-to:cc:to:references; bh=kt+rMautOSHRWTdoP3zp7ymNIlXyHCKLRywW6EpCFZU=; b=JmccFOTUoeKmnkOjLlK0MSNgGmP1FNDr9P+dOOk7Rw7x08B2bWQu1OPN1xtaR2/uJj /xpw54bUdB2oKSRv7jWlNu1bFQi+lqRUS7hHN/tUsf80l/6jBAR55mvGpmvuS9dEH0Q6 b7aExcy20BwbfEiPZ4i+BxGvrl/YP/SYbAbEb1XgXCZXj160ipV8xgzuKU5mPU1+oFOa X3j2FW86bBP96jcdChu0DKTCtdICPBN/BpPVBarhhFLmhyET8qoOckaB6/3Vo6DIESmd 3zWCwiJIZQGqm/0eWWmP5Cte3zVP2YwQ3lC2JE8n0DV6XVfIEIxto1B4a9hQoYK+p5WP LDXQ==
X-Gm-Message-State: AOAM530+vVWVag9RCIqir8sbiPwGiNTbVtvMNDZmsb/DRg+Ja2Gw9NJk dEeu/yteV1u31RAx4Dc6YSqGDQ==
X-Google-Smtp-Source: ABdhPJzBJDVrofaVrkjzhed/+VKHl4EFj9egWLPagSnqf2RPrfAO6HMbShCgKsUfMCV6INemHPyzzw==
X-Received: by 2002:ac8:66c9:: with SMTP id m9mr4774358qtp.43.1613172594924; Fri, 12 Feb 2021 15:29:54 -0800 (PST)
Received: from smtpclient.apple (c-24-91-177-160.hsd1.ma.comcast.net. [24.91.177.160]) by smtp.gmail.com with ESMTPSA id i7sm5148535qke.5.2021.02.12.15.29.53 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Fri, 12 Feb 2021 15:29:53 -0800 (PST)
From: Ted Lemon <mellon@fugue.com>
Message-Id: <CB9EA5F4-A241-46A4-A371-B2A1BFB8C72F@fugue.com>
Content-Type: multipart/alternative; boundary="Apple-Mail=_ACD6499B-FDBA-4FD2-BCA6-3088C68228D2"
Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.80.0.2.32\))
Subject: Re: [v6ops] Scope of Unique Local IPv6 Unicast Addresses (Fwd: New Version Notification for draft-gont-6man-ipv6-ula-scope-00.txt)
Date: Fri, 12 Feb 2021 18:29:52 -0500
In-Reply-To: <b2e51a89-e8a7-9ddb-643d-63a98569b03c@si6networks.com>
Cc: Fred Baker <fredbaker.ietf@gmail.com>, IPv6 Operations <v6ops@ietf.org>, "6man@ietf.org" <6man@ietf.org>
To: Fernando Gont <fgont@si6networks.com>
References: <160989494094.6024.7402128068704112703@ietfa.amsl.com> <6fe3a45e-de65-9f88-808d-ea7e2abdcd16@si6networks.com> <F4E00812-E366-4520-AE17-7BB46E28D575@gmail.com> <b2e51a89-e8a7-9ddb-643d-63a98569b03c@si6networks.com>
X-Mailer: Apple Mail (2.3654.80.0.2.32)
Archived-At: <https://mailarchive.ietf.org/arch/msg/ipv6/AhMCeVjz7m0u6nyPWoTqB9Nog-o>
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: Fri, 12 Feb 2021 23:30:05 -0000

On Feb 12, 2021, at 6:12 PM, Fernando Gont <fgont@si6networks.com> wrote:
> Both the uniqueness scope and the routing scope of ULAs are smaller than
> that of GUAs.

This is true, but the distinction is that there is no automatic mechanism specified for knowing whether a particular ULA is in scope for a link. It’s perfectly valid to use the default route to forward to a ULA destination. If a host were to automatically not do this, things would break all over the place.

IOW, what Fred said is perfectly correct and sensible, but the sense in which ULAs are global is that you should (MUST?) use the default route to route them unless there is a more specific route that matches.

v2.23.0 | Report a Bug | By Email