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Re: [Ntp] Symmetric mode

Doug Arnold <doug.arnold@meinberg-usa.com> Sun, 02 October 2022 09:09 UTC

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From: Doug Arnold <doug.arnold@meinberg-usa.com>
To: Hal Murray <halmurray@sonic.net>
CC: Hal Murray <halmurray@sonic.net>, "ntp@ietf.org" <ntp@ietf.org>
Thread-Topic: [Ntp] Symmetric mode
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Date: Sun, 02 Oct 2022 09:08:49 +0000
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References: Message from Doug Arnold <doug.arnold@meinberg-usa.com> of "Fri, 30 Sep 2022 14:23:22 -0000." <AM7PR02MB5765D115CABA9E9B5A148711CF569@AM7PR02MB5765.eurprd02.prod.outlook.com> <20220930202957.8608D28C1D8@107-137-68-211.lightspeed.sntcca.sbcglobal.net>
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Subject: Re: [Ntp] Symmetric mode
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It seems to me that the over-the-wire protocol should only be about sending timestamps back and forth. What the timestamps are used for belongs in the algorithms and clock control subsystems.

From: Hal Murray <halmurray@sonic.net>
Date: Friday, September 30, 2022 at 10:30 PM
To: Doug Arnold <doug.arnold@meinberg-usa.com>
Cc: Hal Murray <halmurray@sonic.net>, ntp@ietf.org <ntp@ietf.org>
Subject: Re: [Ntp] Symmetric mode

doug.arnold@meinberg-usa.com said:
> Please enlighten me. I've been reading the discussion on symmetric ntp, a
> nd I don=92t understand the purpose. An ntp server can ask other servers for
> time using client server ntp, and use that information to examine its own
> time and that of the peer it is looking at.  Why is a different over-the-wire
> version of the protocol needed?

That's what we are trying to figure out.

Miroslav's draft for NTPv5 dropped symmetric mode.  Some people think it is
interesting but they haven't managed to convince some others of us that it is
important.



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