Re: [Ntp] [internet-drafts@ietf.org: New Version Notification for draft-gruessing-ntp-ntpv5-requirements-02.txt]

Miroslav Lichvar <mlichvar@redhat.com> Mon, 14 June 2021 11:04 UTC

Return-Path: <mlichvar@redhat.com>
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 7C1D53A2046 for <ntp@ietfa.amsl.com>; Mon, 14 Jun 2021 04:04:24 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.794
X-Spam-Level:
X-Spam-Status: No, score=-2.794 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.698, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_BLOCKED=0.001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, 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 (1024-bit key) header.d=redhat.com
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 go1Twe7SVsXv for <ntp@ietfa.amsl.com>; Mon, 14 Jun 2021 04:04:18 -0700 (PDT)
Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 A68D23A2047 for <ntp@ietf.org>; Mon, 14 Jun 2021 04:04:18 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1623668657; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=49OSCt2yBR2Bt2xSFrPSBAHa7J05QOXuI7eSOEn4nJU=; b=E/7PblolpLvWjByqhytErM7p1/DOq1TQLTKXucS1w7YH3GLOH3a93K0RyUGR9Up4vs7sl/ h5zGkhj8tAnXk8Z29oDysTwxetvZXSXZ3j/PiXJTz4+bEjoDKs0CPQNDeTf6GbE52rFSal qkIaWfK6ACHfvu62YTlcl2H6rjJGN80=
Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-36-vDdk8LOvMiiXLlMnDLIGDw-1; Mon, 14 Jun 2021 07:04:13 -0400
X-MC-Unique: vDdk8LOvMiiXLlMnDLIGDw-1
Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 2A5CA18397B5; Mon, 14 Jun 2021 11:04:12 +0000 (UTC)
Received: from localhost (holly.tpb.lab.eng.brq.redhat.com [10.43.134.11]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 499155D720; Mon, 14 Jun 2021 11:04:11 +0000 (UTC)
Date: Mon, 14 Jun 2021 13:04:09 +0200
From: Miroslav Lichvar <mlichvar@redhat.com>
To: James <james.ietf@gmail.com>
Cc: ntp@ietf.org
Message-ID: <YMc3qU1UHSvQT/Gu@localhost>
References: <20210522183113.7ovb2crqg7h5q6fs@de970ef05f79>
MIME-Version: 1.0
In-Reply-To: <20210522183113.7ovb2crqg7h5q6fs@de970ef05f79>
X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15
Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mlichvar@redhat.com
X-Mimecast-Spam-Score: 0
X-Mimecast-Originator: redhat.com
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Archived-At: <https://mailarchive.ietf.org/arch/msg/ntp/cMTGmkBFR2E-Kq88jpUQBgKdQkQ>
Subject: Re: [Ntp] [internet-drafts@ietf.org: New Version Notification for draft-gruessing-ntp-ntpv5-requirements-02.txt]
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: Mon, 14 Jun 2021 11:04:25 -0000

On Sat, May 22, 2021 at 06:31:13PM +0000, James wrote:
> URL:            https://www.ietf.org/archive/id/draft-gruessing-ntp-ntpv5-requirements-02.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-02

I'd like to see this draft considered for adoption. We need to agree
on the NTPv5 requirements before we can discuss the details of the
actual protocol.

I have few comments on some specific parts of the document:

- "The specification MUST have support for servers to notify clients
   that the service is unavailable, and clients MUST have clearly
   defined behaviours honouring this signalling."

  This looks like a good goal but I suspect we may not be able to
  define a useful behavior for an unauthenticated context.

- "Leap second smearing SHOULD NOT be part of the wire specification"

  I think the protocol needs to have some way to indicate that the
  server has leap smearing enabled. Servers implementing leap smear,
  but clients not knowing about it (e.g. using its own leap second
  source) is a major concern in some environments.

- "Encryption and authentication MUST be provided by the protocol
   specification as a default"

  It's not clear to me what the default means here. That it is enabled
  by default in all implementations that support it?

-- 
Miroslav Lichvar