Re: [Ntp] Antw: Re: Calls for Adoption -- NTP Extension Field drafts -- Four separate drafts

Harlan Stenn <stenn@nwtime.org> Tue, 03 September 2019 09:12 UTC

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From: Harlan Stenn <stenn@nwtime.org>
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Date: Tue, 3 Sep 2019 02:12:49 -0700
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Subject: Re: [Ntp] Antw: Re: Calls for Adoption -- NTP Extension Field drafts -- Four separate drafts
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On 9/3/2019 1:13 AM, Hal Murray wrote:
> 
> heiko.gerstung@meinberg.de said:
>>     I'm saying that if a v3 system gets a v4 (or greater) packet, the v3
>>     system should respond with a v3 packet. 
> 
> It can't.  There are fields in a NTP v3 reply that are copied from the request 
> packet.  The v3 only system doesn't know how to find them in a v4 packet.

Of course it can.

We made a conscious choice to make sure the base packet format didn't
change between v3 and v4.

So there's clearly no problem in this case.

> (For v3 and v4, they may be in the same place, but that may not be true for 
> v5.)

I'm being kind and gentle with you here, Hal.

That would be true if we decided to change the base packet format for v5
(or later) in a way that was not backward compatible.

But even if it was a backward incompatible changes, it would fall to the
WG to justify this change and come up with a way forward.

Offhand, I can think of several ways to do this.

-- 
Harlan Stenn, Network Time Foundation
http://nwtime.org - be a Member!