IETF Logo Mail Archive

Re: [6tisch] ND cache entries creation on first-hop routers

Lorenzo Colitti <lorenzo@google.com> Wed, 03 July 2019 22:40 UTC

Return-Path: <lorenzo@google.com>
X-Original-To: 6tisch@ietfa.amsl.com
Delivered-To: 6tisch@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 637CE1200EC for <6tisch@ietfa.amsl.com>; Wed, 3 Jul 2019 15:40:34 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -17.499
X-Spam-Level:
X-Spam-Status: No, score=-17.499 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, ENV_AND_HDR_SPF_MATCH=-0.5, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5, USER_IN_DEF_SPF_WL=-7.5] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=google.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 SdQHA_vqBHS1 for <6tisch@ietfa.amsl.com>; Wed, 3 Jul 2019 15:40:32 -0700 (PDT)
Received: from mail-wm1-x32e.google.com (mail-wm1-x32e.google.com [IPv6:2a00:1450:4864:20::32e]) (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 0A7281200D6 for <6tisch@ietf.org>; Wed, 3 Jul 2019 15:40:32 -0700 (PDT)
Received: by mail-wm1-x32e.google.com with SMTP id f17so4004518wme.2 for <6tisch@ietf.org>; Wed, 03 Jul 2019 15:40:31 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=Vq9cBy4ScXv7fCHc1BEj2Hpeym59r4iUY0kc39RwdgU=; b=ENpYQcdAa8Rj2+VRXhctEm5ZjKRY2ZqKdp8bcpN6MbOFYIPiIS6XcqBy/fwBJLxdyQ BLcbG6c56ZzVURoDXwdUUkguqMurgE4nl663FMx69z0hqYB7fuNrmb8o9sSvOKRbK1TD xcF6LxGritAAKIXq5UKm0DDMKbjF6NKuK5AHjW/5ZaWaCkvchY34mFTX/oFMwGLCIMXk GlroX2EQnsRY2hB4dzTKtu6i0DHTyDQFyIisHJC92tt8RQSvRMH42Z+M2NFyVCzCguZd 2kcEovhlplJNelimXJlKoSY7+PlphlrYDGxacIkrgjv2UIbib0pLqrp2WC+qFCIWJFJr ukhg==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=Vq9cBy4ScXv7fCHc1BEj2Hpeym59r4iUY0kc39RwdgU=; b=AU7wAWsP9bNRdddCYFa7Va3au57EftoRbpKjcapfcrC0dAR67Um66QyYz4QaBS4M91 tmkkidpvJ3l8Qo0k52ptxgRCWVKTNKdCqN07ft4srYAOI6ChicwxEaX66gMtAiw0GNqg EFb/U9Ft8btknjqyZ/zUaHP1EdQ39OGJkaWDHE19++lTHBkivkfXvF9yJnslKizseHuB wCkHEgeQxhVS1RmU/eqYUUA4nJFJs07CL3Koc7ZrihhLO30VPmQNTBEILbj3CQua34Mp V2rcaDjvqmxg9/YCNhDn8APSf1aWyBW/Uej6NaLMZSiRMwGPnJ8B5Bu5cWq9eaoEGesl LBPQ==
X-Gm-Message-State: APjAAAUP2LW5ykyA71SMUTPK99ZQfdYH4/EWPSngin9Ur8/p2ePhGL88 QB4vmlUoDmTMw8ObJNqGwfoKdTK7KXIN2hI7qniHmg==
X-Google-Smtp-Source: APXvYqyJBGSxcn61lPRMBTdKxG5gA1nqQhU3A8QiNr6AcNgvaPToh8+Nh/YI19rxGz3U5vDX1iiQQ+1PDrWaOkbLCB0=
X-Received: by 2002:a05:600c:23d2:: with SMTP id p18mr9081431wmb.108.1562193630103; Wed, 03 Jul 2019 15:40:30 -0700 (PDT)
MIME-Version: 1.0
References: <CAFU7BAQ4xrjNn9-EUyRhyHKDDT=f381Z4T6x6qJ=ftm2D2K4cw@mail.gmail.com> <5377.1562081856@localhost> <CAFU7BAQomCzfDQaAOpJO7CmQYiAVzHFThviLv7r-0=C9v4MD-w@mail.gmail.com> <13349.1562180358@localhost>
In-Reply-To: <13349.1562180358@localhost>
From: Lorenzo Colitti <lorenzo@google.com>
Date: Thu, 04 Jul 2019 07:40:16 +0900
Message-ID: <CAKD1Yr1ZKYQ6ZtDZj-uiQg9RTzZzqnKxn=iXGoqDKTs7FRHObQ@mail.gmail.com>
To: Michael Richardson <mcr+ietf@sandelman.ca>
Cc: Jen Linkova <furry13@gmail.com>, 6lo@ietf.org, 6tisch@ietf.org, V6 Ops List <v6ops@ietf.org>, 6man <6man@ietf.org>
Content-Type: multipart/alternative; boundary="00000000000065291b058cce8c02"
Archived-At: <https://mailarchive.ietf.org/arch/msg/6tisch/h980su7_oroFhwn-1-baGzTjM7A>
Subject: Re: [6tisch] ND cache entries creation on first-hop routers
X-BeenThere: 6tisch@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tisch.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/6tisch>, <mailto:6tisch-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/6tisch/>
List-Post: <mailto:6tisch@ietf.org>
List-Help: <mailto:6tisch-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/6tisch>, <mailto:6tisch-request@ietf.org?subject=subscribe>
X-List-Received-Date: Wed, 03 Jul 2019 22:40:34 -0000

On Thu, 4 Jul 2019, 04:00 Michael Richardson, <mcr+ietf@sandelman.ca> wrote:

> Let me suggest a different hack: use stateful DHCPv6.
>

DHCPv6 doesn't fix this because a) DHCP goes to a server, not the router,
b) DHCPv6 uses link-local addresses and not the global addresses, c) there
is nothing in the DHCPv6 specs about explicitly populating ND caches.

For off-link servers, the router can perform layering violations such as
"snoop DHCPv6 replies and add them to the neighbour cache". But such
layering violations don't require DHCPv6. For example, the router can also
snoop DAD packets, or glean ND cache entries from forwarded packets.

>

v2.46.0 | Report a Bug | By Email | System Status