Re: [6lo] draft-ietf-6lo-minimal-fragment-00: When to remove VRB entries?

Carsten Bormann <cabo@tzi.org> Thu, 07 February 2019 11:25 UTC

Return-Path: <cabo@tzi.org>
X-Original-To: 6lo@ietfa.amsl.com
Delivered-To: 6lo@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C6A5E13110B for <6lo@ietfa.amsl.com>; Thu, 7 Feb 2019 03:25:08 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -4.199
X-Spam-Level:
X-Spam-Status: No, score=-4.199 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, URIBL_BLOCKED=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 HOnIQLJfsm6C for <6lo@ietfa.amsl.com>; Thu, 7 Feb 2019 03:25:07 -0800 (PST)
Received: from mailhost.informatik.uni-bremen.de (mailhost.informatik.uni-bremen.de [IPv6:2001:638:708:30c9::12]) (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 5001013110F for <6lo@ietf.org>; Thu, 7 Feb 2019 03:25:07 -0800 (PST)
X-Virus-Scanned: amavisd-new at informatik.uni-bremen.de
Received: from submithost.informatik.uni-bremen.de (submithost2.informatik.uni-bremen.de [134.102.200.7]) by mailhost.informatik.uni-bremen.de (8.14.5/8.14.5) with ESMTP id x17BOvwI017743; Thu, 7 Feb 2019 12:25:02 +0100 (CET)
Received: from [192.168.217.106] (p54A6CC50.dip0.t-ipconnect.de [84.166.204.80]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by submithost.informatik.uni-bremen.de (Postfix) with ESMTPSA id 43wGF539wpz1Br6; Thu, 7 Feb 2019 12:24:57 +0100 (CET)
Content-Type: text/plain; charset="utf-8"
Mime-Version: 1.0 (Mac OS X Mail 11.5 \(3445.9.1\))
From: Carsten Bormann <cabo@tzi.org>
In-Reply-To: <CALHmdRwqF972Y4DG8x9QW_fg+AkwnQtzUVSgyE77FBYYO0SLpQ@mail.gmail.com>
Date: Thu, 07 Feb 2019 12:24:56 +0100
Cc: 6lo@ietf.org
X-Mao-Original-Outgoing-Id: 571231494.964187-e1aaa1b6bfdef230ab009269b0797824
Content-Transfer-Encoding: quoted-printable
Message-Id: <E128376B-7AB7-4A59-A3EB-7A46F0B8250C@tzi.org>
References: <CALHmdRwqF972Y4DG8x9QW_fg+AkwnQtzUVSgyE77FBYYO0SLpQ@mail.gmail.com>
To: Martine Lenders <m.lenders@fu-berlin.de>
X-Mailer: Apple Mail (2.3445.9.1)
Archived-At: <https://mailarchive.ietf.org/arch/msg/6lo/1JuyPvp_J6JljUgGmMSyK0PBsAM>
Subject: Re: [6lo] draft-ietf-6lo-minimal-fragment-00: When to remove VRB entries?
X-BeenThere: 6lo@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: "Mailing list for the 6lo WG for Internet Area issues in IPv6 over constrained node networks." <6lo.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/6lo>, <mailto:6lo-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/6lo/>
List-Post: <mailto:6lo@ietf.org>
List-Help: <mailto:6lo-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/6lo>, <mailto:6lo-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 07 Feb 2019 11:25:09 -0000

On Feb 6, 2019, at 15:49, Martine Lenders <m.lenders@fu-berlin.de> wrote:
> 
> However, I'm unsure how I can determine when it is safe to remove a VRB entry at least for the minimal forwarding case (even for a successfully transmitted datagram). As far as I have seen not even the original VRB draft [4] mentions a strategy for that.

We did not discuss this in the draft because it is somewhat equivalent to timing out real reassembly buffers (RRBs? :-).  But maybe the strategy can be tweaked for VRB, so that is not a bad question at all.

Grüße, Carsten