[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [ippm] Next version of the duplicate draft
Hi,
so this says that the source and destination IP address need to be the
same for packet to be duplicates, but it's still vague about which
fields in the next header ("transport" header, usually) need to be
identical. I'm not convinced that this text will lead to implementations
that will come up with the same measurement results for the same packet
sequence. Can we be more precise?
I think it does as long as you don't look at any other fields than source,
destination and information.
Each packet has source, destination, a bunch of other headers and finally
the information that it carries. On the receiving side, one records the
packets and for each arriving packet, one checks if one has arrived before
with the same source, destination and information (within the time-out
interval). If so, it is a duplicate. If not, it isn't.
The real question, I think, is whether there can be cases where the source
intentionally sends multiple packets with the same src, dst and information
(but something different in the other headers).
Henk
--
---------------------------------------From ippm-bounces at ietf.org Tue Jul 1 05:51:55 2008
Return-Path: <ippm-bounces at ietf.org>
X-Original-To: ippm-archive at megatron.ietf.org
Delivered-To: ietfarch-ippm-archive at core3.amsl.com
Received: from [127.0.0.1] (localhost [127.0.0.1])
by core3.amsl.com (Postfix) with ESMTP id 7AA043A68AC;
Tue, 1 Jul 2008 05:51:55 -0700 (PDT)
X-Original-To: ippm at core3.amsl.com
Delivered-To: ippm at core3.amsl.com
Received: from localhost (localhost [127.0.0.1])
by core3.amsl.com (Postfix) with ESMTP id A6D203A68AC
for <ippm at core3.amsl.com>; Tue, 1 Jul 2008 05:51:54 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -10.599
X-Spam-Level:
X-Spam-Status: No, score=-10.599 tagged_above=-999 required=5
tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8]
Received: from mail.ietf.org ([64.170.98.32])
by localhost (core3.amsl.com [127.0.0.1]) (amavisd-new, port 10024)
with ESMTP id HeiFfQAZkGhb for <ippm at core3.amsl.com>;
Tue, 1 Jul 2008 05:51:50 -0700 (PDT)
Received: from postboy.ripe.net (postboy.ripe.net [193.0.19.3])
by core3.amsl.com (Postfix) with ESMTP id 797153A67AA
for <ippm at ietf.org>; Tue, 1 Jul 2008 05:51:50 -0700 (PDT)
Received: by postboy.ripe.net (Postfix, from userid 4008)
id 3E5ED6A047; Tue, 1 Jul 2008 14:52:00 +0200 (CEST)
Received: from herring.ripe.net (herring.ripe.net [193.0.1.203])
by postboy.ripe.net (Postfix) with ESMTP id 6EB836A00E;
Tue, 1 Jul 2008 14:51:59 +0200 (CEST)
Received: from RIPE-NCC-101045.local (gw.office.nsrp.ripe.net [193.0.1.126])
by herring.ripe.net (Postfix) with ESMTP id 5BB9A2F583;
Tue, 1 Jul 2008 14:51:59 +0200 (CEST)
Message-ID: <486A285C.9040904 at ripe.net>
Date: Tue, 01 Jul 2008 14:51:40 +0200
From: Henk Uijterwaal <henk at ripe.net>
User-Agent: Thunderbird 2.0.0.9 (Macintosh/20071031)
MIME-Version: 1.0
To: Lars Eggert <lars.eggert at nokia.com>
References: <485BBABF.5070002 at internet2.edu> <BDC0ED29-C3D8-42FC-BB12-EA9018BFD3B2 at nokia.com> <4868A492.9000803 at ripe.net>
<BC1A81F7-4888-46EE-A5D8-04D72621939B at nokia.com>
In-Reply-To: <BC1A81F7-4888-46EE-A5D8-04D72621939B at nokia.com>
X-RIPE-Spam-Level:
X-RIPE-Spam-Tests: ALL_TRUSTED,BAYES_00
X-RIPE-Spam-Status: N 0.000001 / -4.4
X-RIPE-Signature: 0ec5ab69f01d9ed5fcde50d5932f2826
Cc: IETF IPPM WG <ippm at ietf.org>
Subject: Re: [ippm] Next version of the duplicate draft
X-BeenThere: ippm at ietf.org
X-Mailman-Version: 2.1.9
Precedence: list
List-Id: IETF IP Performance Metrics Working Group <ippm.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/listinfo/ippm>,
<mailto:ippm-request at ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/pipermail/ippm>
List-Post: <mailto:ippm at ietf.org>
List-Help: <mailto:ippm-request at ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/ippm>,
<mailto:ippm-request at ietf.org?subject=subscribe>
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset="us-ascii"; Format="flowed"
Sender: ippm-bounces at ietf.org
Errors-To: ippm-bounces at ietf.org
Hi,
so this says that the source and destination IP address need to be the
same for packet to be duplicates, but it's still vague about which
fields in the next header ("transport" header, usually) need to be
identical. I'm not convinced that this text will lead to implementations
that will come up with the same measurement results for the same packet
sequence. Can we be more precise?
I think it does as long as you don't look at any other fields than source,
destination and information.
Each packet has source, destination, a bunch of other headers and finally
the information that it carries. On the receiving side, one records the
packets and for each arriving packet, one checks if one has arrived before
with the same source, destination and information (within the time-out
interval). If so, it is a duplicate. If not, it isn't.
The real question, I think, is whether there can be cases where the source
intentionally sends multiple packets with the same src, dst and information
(but something different in the other headers).
Henk
--
--------------------------------------------------------------------------------------
Henk Uijterwaal Email: henk.uijterwaal(at)ripe.net
RIPE Network Coordination Centre http://www.amsterdamned.org/~henk
P.O.Box 10096 Singel 258 Phone: +31.20.5354414
1001 EB Amsterdam 1016 AB Amsterdam Fax: +31.20.5354445
The Netherlands The Netherlands Mobile: +31.6.55861746
------------------------------------------------------------------------------
Is one of the choices leaving the office open?
Alan Greenspan on the next elections
_______________________________________________
ippm mailing list
ippm at ietf.org
https://www.ietf.org/mailman/listinfo/ippm
-------------------------------
Henk Uijterwaal Email: henk.uijterwaal(at)ripe.net
RIPE Network Coordination Centre http://www.amsterdamned.org/~henk
P.O.Box 10096 Singel 258 Phone: +31.20.5354414
1001 EB Amsterdam 1016 AB Amsterdam Fax: +31.20.5354445
The Netherlands The Netherlands Mobile: +31.6.55861746
------------------------------------------------------------------------------
Is one of the choices leaving the office open?
Alan Greenspan on the next elections
_______________________________________________
ippm mailing list
ippm at ietf.org
https://www.ietf.org/mailman/listinfo/ippm