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

Martin Burnicki <martin.burnicki@meinberg.de> Wed, 06 January 2021 10:50 UTC

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To: Philip Prindeville <philipp@redfish-solutions.com>, Martin Burnicki <martin.burnicki=40meinberg.de@dmarc.ietf.org>
Cc: Miroslav Lichvar <mlichvar@redhat.com>, Hal Murray <hmurray@megapathdsl.net>, ntp@ietf.org
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From: Martin Burnicki <martin.burnicki@meinberg.de>
Organization: Meinberg Funkuhren GmbH & Co. KG, Bad Pyrmont, Germany
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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 9:09 AM, Martin Burnicki <martin.burnicki=40meinberg.de@dmarc.ietf.org> wrote:
>>
>> For NTP, things are different. There is a huge base of NTPv4
>> installations, and making NTPv5 basically compatible with v4 would IMO
>> strongly increase the acceptance of NTPv5.
> 
> 
> The logical corollary to this argument is that because there ARE a lot of servers, it’s not unreasonable to think that there will be a lot of both NTPv4 and NTPv5 servers co-existing in the future, and the user is free to peer with either.

So you think it's not necessary to upgrade v4 nodes to v5, as it has
been done from v3 to v4? Simply systems should stick with v4 and only
enhanced system should start using v5?

In this case, wouldn't it be better to start defining a completely new
protocol and e.g. call it "Extended Time Protocol", which can be chosen
instead of NTP? This would be similar to PTP, which you can use instead
of NTP. ;-)

> Which eliminates the need for NTPv5 servers to also speak NTPv4.

If you have a large network with different types of client you will need
to provide NTPv4 and "ETP" (AKA NTPv5) if NTPv5 has requirements that
are not needed and can't be supported by some clients.


Martin
-- 
Martin Burnicki

Senior Software Engineer

MEINBERG Funkuhren GmbH & Co. KG
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