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

Daniel Franke <dfoxfranke@gmail.com> Mon, 09 September 2019 15:46 UTC

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From: Daniel Franke <dfoxfranke@gmail.com>
Date: Mon, 9 Sep 2019 11:46:28 -0400
Message-ID: <CAJm83bDxUZx9Ea9TOSBDh=MjrM4iG4iqmBQ3UVUQdo0EK0AM3A@mail.gmail.com>
To: "Salz, Rich" <rsalz@akamai.com>
Cc: Harlan Stenn <stenn@nwtime.org>, "ntp@ietf.org" <ntp@ietf.org>
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Subject: Re: [Ntp] Antw: Re: Calls for Adoption -- NTP Extension Field drafts -- Four separate drafts
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On Mon, Sep 9, 2019 at 11:32 AM Salz, Rich <rsalz@akamai.com> wrote:
>
> >    I continue to maintain that a response should be with a packet at the
>     highest version level we speak that does not exceed the version of the
>     incoming packet.
>
> I think this is a very interesting idea and deserves careful thought.
>
> Are there unique error codes in v3 and v4 that a v5 client could recognize as "you're too modern for me" ?

No, but we could always introduce a new KISS code. Asking a v4 server
to know how to respond to a v5 client with an error cognizable to the
client is reasonable. But what Harlan seems to be asking, which I
think is a terrible idea, is that v4 servers be able to respond
*successfully* to v5 clients by assuming that v5 header fields are no
different from v4 header fields, thus basically locking us into old
design decisions for eternity.