IETF Logo Mail Archive

Re: [Ntp] Antw: [EXT] Re: CLOCK_TAI (was NTPv5: big picture)

Martin Burnicki <martin.burnicki@meinberg.de> Thu, 07 January 2021 15:35 UTC

Return-Path: <martin.burnicki@meinberg.de>
X-Original-To: ntp@ietfa.amsl.com
Delivered-To: ntp@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 622B43A1235 for <ntp@ietfa.amsl.com>; Thu, 7 Jan 2021 07:35:30 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.361
X-Spam-Level:
X-Spam-Status: No, score=-2.361 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.262, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=meinberg.de
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 VnkwxqJBsVzD for <ntp@ietfa.amsl.com>; Thu, 7 Jan 2021 07:35:28 -0800 (PST)
Received: from server1a.meinberg.de (server1a.meinberg.de [176.9.44.212]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 296BB3A1233 for <ntp@ietf.org>; Thu, 7 Jan 2021 07:35:28 -0800 (PST)
Received: from srv-kerioconnect.py.meinberg.de (unknown [193.158.22.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by server1a.meinberg.de (Postfix) with ESMTPSA id CAC4271C0781; Thu, 7 Jan 2021 16:35:25 +0100 (CET)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=meinberg.de; s=dkim; t=1610033725; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=KcZ/gRYxjMOr2sI9hFSPQ2Ftb8/0kiAtOvduj16RTTA=; b=BchALeV0Zn8ecEeaqKvhfi3iv3IPgMJiQScVSdvwDzdh7d0rFYfaFSi2u7+qegch4zRivj k+2lNR/rwDnTLRdxKDd41NPm5h+US+TUClTwWhtrlp5N4jrf1Q8VZ8NJWgNnQhZqFOsoad 4m37vNqicSKEyu9PLBPacfvQNNzd3YhrWViX8SIbAhQm62loZfMOyP96B42zaGlsYV1ilb /+ZklzTBXJo+W5jgXuerhCfLTY9JfjTT5ikg+aeoj0rRSej8Lck/ZC4efxSdw1+vB2jhRH JhYjO5VNM14vPN2DM5ViQOc2PUOM4o/+QGoyt/LHBtTVwFHW5pW/vAIB6Nv4kQ==
X-Footer: bWVpbmJlcmcuZGU=
Received: from localhost ([127.0.0.1]) by srv-kerioconnect.py.meinberg.de with ESMTPSA (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256 bits)); Thu, 7 Jan 2021 16:35:23 +0100
To: Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>, "ntp@ietf.org" <ntp@ietf.org>, emmanuel.fuste@thalesgroup.com
References: <20210105124544.5EF5C40605C@ip-64-139-1-69.sjc.megapath.net> <f876a3ff-16ee-fc63-c27c-d5a3cb847a3d@meinberg.de> <4E78BB38-5FA2-4974-AB25-85C5AD9E7DBE@redfish-solutions.com> <8cdc69d3-c795-6fee-3e5c-9ae11694e3da@meinberg.de> <1af7e53f-1251-ea15-dde9-da165c3b5b49@thalesgroup.com> <0af0e655-9f1b-7407-9065-9e3aa7b057d6@meinberg.de> <5FF6C679020000A10003E046@gwsmtp.uni-regensburg.de>
From: Martin Burnicki <martin.burnicki@meinberg.de>
Organization: Meinberg Funkuhren GmbH & Co. KG, Bad Pyrmont, Germany
Message-ID: <1e858329-983b-99d0-d3b2-204c6092ff9e@meinberg.de>
Date: Thu, 07 Jan 2021 16:35:22 +0100
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0
MIME-Version: 1.0
In-Reply-To: <5FF6C679020000A10003E046@gwsmtp.uni-regensburg.de>
Content-Type: text/plain; charset="utf-8"
Content-Language: en-US
Content-Transfer-Encoding: 8bit
Archived-At: <https://mailarchive.ietf.org/arch/msg/ntp/VXdiTCwf-Xvfe1hRkcJ8UOfvPvs>
Subject: Re: [Ntp] Antw: [EXT] Re: CLOCK_TAI (was NTPv5: big picture)
X-BeenThere: ntp@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: <ntp.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/ntp>, <mailto:ntp-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/ntp/>
List-Post: <mailto:ntp@ietf.org>
List-Help: <mailto:ntp-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/ntp>, <mailto:ntp-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 07 Jan 2021 15:35:30 -0000

Ulrich Windl wrote:
>> Burnicki<martin.burnicki=40meinberg.de@dmarc.ietf.org>  wrote:
[...]
>> As I tried to explain in earlier messages, you can easily make it fully
>> compatible and support new features by extensions.
> 
> I still think the v4 extension field mechanism was a big mistake and the
> mechanism should be redone for a clean design.
> So v4 should remain v4 and v5 should be something better.

For the original extension fields, I agree. What I meant are the new
extensions fields that have been defined in the recent past.

>>> It is NTPv4 or NTPv5.
>>
>> In the first place it is NTP. If you think you need to completely
>> redesign it, just give it a different name.
> 
> 
> Do you see "NTP" as "packets" only? I think "packets" can be changed easily;
> they are just the representation of information, not the information itself.

Of course, not.

However, the basic packet is what provides the basic information that is
available to the algorithms that exchange the packets.

Since most systems use UTC or local time derived from it, that is IMO
what should be in the base packet.

If systems support or even need TAI, you can provide the necessary
information in an extension field. Similar with authentication like NTS.


Martin
-- 
Martin Burnicki

Senior Software Engineer

MEINBERG Funkuhren GmbH & Co. KG
Email: martin.burnicki@meinberg.de
Phone: +49 5281 9309-414
Linkedin: https://www.linkedin.com/in/martinburnicki/

Lange Wand 9, 31812 Bad Pyrmont, Germany
Amtsgericht Hannover 17HRA 100322
Geschäftsführer/Managing Directors: Günter Meinberg, Werner Meinberg,
Andre Hartmann, Heiko Gerstung
Websites: https://www.meinberg.de  https://www.meinbergglobal.com
Training: https://www.meinberg.academy

v2.23.0 | Report a Bug | By Email