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

Martin Burnicki <martin.burnicki@meinberg.de> Wed, 06 January 2021 10:36 UTC

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To: Philip Prindeville <philipp@redfish-solutions.com>, Hal Murray <hmurray@megapathdsl.net>
Cc: Miroslav Lichvar <mlichvar@redhat.com>, ntp@ietf.org
References: <20210105124544.5EF5C40605C@ip-64-139-1-69.sjc.megapath.net> <FAA34AF4-4559-4F0A-9D6F-52CD72F61817@redfish-solutions.com>
From: Martin Burnicki <martin.burnicki@meinberg.de>
Organization: Meinberg Funkuhren GmbH & Co. KG, Bad Pyrmont, Germany
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Date: Wed, 06 Jan 2021 11:36:24 +0100
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Subject: Re: [Ntp] CLOCK_TAI (was NTPv5: big picture)
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Philip Prindeville wrote:
>> On Jan 5, 2021, at 5:45 AM, Hal Murray <hmurray@megapathdsl.net> wrote:
>>
>> A copy of the leap seconds file is included by the Time Zone project and 
>> distributed by IANA.  Most distros are already setup to keep the time zone 
>> info up to date.  It should be simple for the leap file to go along for the 
>> ride.  Debian already does it.
> 
> That seems like a good argument to NOT include it in the protocol, if it’s already available out-of-band.

If you force using TAI for NTP but don't include the relevant
information in the NTP protocol, this means that you are generally
unable to operate NTP properly unless you always take care and maintain
the additional information.

In the past there was no such requirement, and I think it's a drawback
if you add such a requirement now.


Martin
-- 
Martin Burnicki

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