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Re: [Ntp] Antw: Re: Antw: [EXT] Re: New Version Notification for draft‑gruessing‑ntp‑ntpv5‑requirements‑03.txt

Doug Arnold <doug.arnold@meinberg-usa.com> Thu, 21 October 2021 13:36 UTC

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From: Doug Arnold <doug.arnold@meinberg-usa.com>
To: Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>, "mlichvar@redhat.com" <mlichvar@redhat.com>, "halmurray+ietf@sonic.net" <halmurray+ietf@sonic.net>
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Thread-Topic: [Ntp] Antw: Re: Antw: [EXT] Re: New Version Notification for draft‑gruessing‑ntp‑ntpv5‑requirements‑03.txt
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Date: Thu, 21 Oct 2021 13:36:02 +0000
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Subject: Re: [Ntp] Antw: Re: Antw: [EXT] Re: New Version Notification for draft‑gruessing‑ntp‑ntpv5‑requirements‑03.txt
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One thing to keep in mind is that the use case for leap smearing is that it happens in a private network, where all Stratum 1 servers are configured the same.  I still consider it dangerous, though.

________________________________
From: ntp <ntp-bounces@ietf.org> on behalf of Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>
Sent: Thursday, October 21, 2021 7:12 AM
To: mlichvar@redhat.com <mlichvar@redhat.com>; halmurray+ietf@sonic.net <halmurray+ietf@sonic.net>
Cc: ntp@ietf.org <ntp@ietf.org>
Subject: [Ntp] Antw: Re: Antw: [EXT] Re: New Version Notification for draft‑gruessing‑ntp‑ntpv5‑requirements‑03.txt

>>> Hal Murray <halmurray+ietf@sonic.net> schrieb am 21.10.2021 um 11:20 in
Nachricht
<20211021092000.13DDD28C157@107-137-68-211.lightspeed.sntcca.sbcglobal.net>:

...
> The root of the problem is smearing.  The current implementation hides it
> from
> the client software.
...

I wondered: Requiring that smearing servers lower (increase) their startum by one or two?
So when mixing sources, the non-smearing servers might win the selection.

An other question: Can a smearing server be confused when getting smeared time from another smearing server?
(something like: time is "t", but server smeared it to "t-0.5". The receiving server thinks it has to smear it to "t-0.5-1" eventually.)

Regards,
Ulrich


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