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Re: [Ntp] Fwd: New Version Notification for draft-gruessing-ntp-ntpv5-requirements-03.txt

Doug Arnold <doug.arnold@meinberg-usa.com> Thu, 14 October 2021 22:45 UTC

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From: Doug Arnold <doug.arnold@meinberg-usa.com>
To: James <james.ietf@gmail.com>, NTP WG <ntp@ietf.org>
Thread-Topic: [Ntp] Fwd: New Version Notification for draft-gruessing-ntp-ntpv5-requirements-03.txt
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Date: Thu, 14 Oct 2021 22:45:18 +0000
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Subject: Re: [Ntp] Fwd: New Version Notification for draft-gruessing-ntp-ntpv5-requirements-03.txt
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Thanks James,

I think that this is pretty close to what is needed for ntpv5.  I like the separation of protocol and algorithms, and the use of monotonic timescale for timestamp fields (at least by default), and the insistence on security.

I have two comments:
1. Why do you think that encryption should be the default mode? People often consider timing information to be critical but not secret.  Also it is likely to affect accuracy in implementations by adding a variable delay to encrypt.

2. I think that it is better to allow leap smearing and make it a visible part of the protocol than to pretend it is not going to happen.  On this topic I think that Miroslav’s proposal was more realistic.  Data center network architects tell me they definitely plan to continue to do leap smearing.

Doug

From: ntp <ntp-bounces@ietf.org> on behalf of James <james.ietf@gmail.com>
Date: Sunday, October 10, 2021 at 2:02 PM
To: NTP WG <ntp@ietf.org>
Subject: [Ntp] Fwd: New Version Notification for draft-gruessing-ntp-ntpv5-requirements-03.txt
Despite saying I was going to hold off making a new version, I've made
some changes to prevent expiration ahead of IETF 112, including an
initial threat model and other minor changes.
The working group's feedback as always would be appreciated.

- J

---------- Forwarded message ---------
From: <internet-drafts@ietf.org>
Date: Sun, 10 Oct 2021 at 10:02
Subject: New Version Notification for
draft-gruessing-ntp-ntpv5-requirements-03.txt
To: James Gruessing <james.ietf@gmail.com>



A new version of I-D, draft-gruessing-ntp-ntpv5-requirements-03.txt
has been successfully submitted by James Gruessing and posted to the
IETF repository.

Name:           draft-gruessing-ntp-ntpv5-requirements
Revision:       03
Title:          NTPv5 use cases and requirements
Document date:  2021-10-10
Group:          Individual Submission
Pages:          8
URL:
https://www.ietf.org/archive/id/draft-gruessing-ntp-ntpv5-requirements-03.txt
Status:
https://datatracker.ietf.org/doc/draft-gruessing-ntp-ntpv5-requirements/
Htmlized:
https://datatracker.ietf.org/doc/html/draft-gruessing-ntp-ntpv5-requirements
Diff:
https://www.ietf.org/rfcdiff?url2=draft-gruessing-ntp-ntpv5-requirements-03

Abstract:
   This document describes the use cases, requirements, and
   considerations that should be factored in the design of a successor
   protocol to supersede version 4 of the NTP protocol [RFC5905]
   presently referred to as NTP version 5 ("NTPv5").  This document is
   non-exhaustive and does not in its current version represent working
   group consensus.




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