Re: [homenet] DNCP/HNCP Revisited

Juliusz Chroboczek <jch@irif.fr> Wed, 18 September 2019 23:09 UTC

Return-Path: <jch@irif.fr>
X-Original-To: homenet@ietfa.amsl.com
Delivered-To: homenet@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C30FB12011B for <homenet@ietfa.amsl.com>; Wed, 18 Sep 2019 16:09:47 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.9
X-Spam-Level:
X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, 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 x8nul6V2eEJQ for <homenet@ietfa.amsl.com>; Wed, 18 Sep 2019 16:09:46 -0700 (PDT)
Received: from korolev.univ-paris7.fr (korolev.univ-paris7.fr [IPv6:2001:660:3301:8000::1:2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 82535120111 for <homenet@ietf.org>; Wed, 18 Sep 2019 16:09:46 -0700 (PDT)
Received: from mailhub.math.univ-paris-diderot.fr (mailhub.math.univ-paris-diderot.fr [81.194.30.253]) by korolev.univ-paris7.fr (8.14.4/8.14.4/relay1/82085) with ESMTP id x8IN9fHW015036; Thu, 19 Sep 2019 01:09:41 +0200
Received: from mailhub.math.univ-paris-diderot.fr (localhost [127.0.0.1]) by mailhub.math.univ-paris-diderot.fr (Postfix) with ESMTP id 5849F5455C; Thu, 19 Sep 2019 01:09:44 +0200 (CEST)
X-Virus-Scanned: amavisd-new at math.univ-paris-diderot.fr
Received: from mailhub.math.univ-paris-diderot.fr ([127.0.0.1]) by mailhub.math.univ-paris-diderot.fr (mailhub.math.univ-paris-diderot.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id GZE5xrT8heIW; Thu, 19 Sep 2019 01:09:43 +0200 (CEST)
Received: from pirx.irif.fr (unknown [78.194.40.74]) (Authenticated sender: jch) by mailhub.math.univ-paris-diderot.fr (Postfix) with ESMTPSA id 4CCD55455A; Thu, 19 Sep 2019 01:09:42 +0200 (CEST)
Date: Thu, 19 Sep 2019 01:09:42 +0200
Message-ID: <877e65b3rd.wl-jch@irif.fr>
From: Juliusz Chroboczek <jch@irif.fr>
To: Gert Doering <gert@space.net>
Cc: "Ray Hunter (v6ops)" <v6ops@globis.net>, HOMENET <homenet@ietf.org>
In-Reply-To: <20190918205732.GL55186@Space.Net>
References: <2737406f-c615-3963-2226-d2eadf79e846@globis.net> <87a7b1bdhe.wl-jch@irif.fr> <DE13B405-C1B6-4603-84DC-F7A8E22EF075@fugue.com> <20190918205732.GL55186@Space.Net>
User-Agent: Wanderlust/2.15.9
MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue")
Content-Type: text/plain; charset="US-ASCII"
X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.7 (korolev.univ-paris7.fr [194.254.61.138]); Thu, 19 Sep 2019 01:09:41 +0200 (CEST)
X-Miltered: at korolev with ID 5D82B935.000 by Joe's j-chkmail (http : // j-chkmail dot ensmp dot fr)!
X-j-chkmail-Enveloppe: 5D82B935.000 from mailhub.math.univ-paris-diderot.fr/mailhub.math.univ-paris-diderot.fr/null/mailhub.math.univ-paris-diderot.fr/<jch@irif.fr>
X-j-chkmail-Score: MSGID : 5D82B935.000 on korolev.univ-paris7.fr : j-chkmail score : . : R=. U=. O=. B=0.000 -> S=0.000
X-j-chkmail-Status: Ham
Archived-At: <https://mailarchive.ietf.org/arch/msg/homenet/9V8Oev6Ie2_xyMBkln440oXoJq4>
Subject: Re: [homenet] DNCP/HNCP Revisited
X-BeenThere: homenet@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: IETF Homenet WG mailing list <homenet.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/homenet>, <mailto:homenet-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/homenet/>
List-Post: <mailto:homenet@ietf.org>
List-Help: <mailto:homenet-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/homenet>, <mailto:homenet-request@ietf.org?subject=subscribe>
X-List-Received-Date: Wed, 18 Sep 2019 23:09:48 -0000

> If you have a discontinuous L2 MTU, you do not need fragmented packets
> to see packets disappear.

Ah, I see.

> No fragmentation of any sort involved, just incorrectly set up L2 segments.

Right.  It's an incorrect network setup.

To fix that, it should be enough to point the tunnel directly at a Homenet
router rather than relying on bridging.  (A good idea in any case, since
Babel is able to make better routing decisions if the tunnel is directly
visible to it.)

-- Juliusz