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Re: [Ntp] Leap second draft

Martin Burnicki <martin.burnicki@meinberg.de> Mon, 01 April 2019 13:03 UTC

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To: Tony Finch <dot@dotat.at>, Kurt Roeckx <kurt@roeckx.be>
Cc: ntp@ietf.org, Daniel Franke <dfoxfranke@gmail.com>
References: <CAJm83bD5Ozkpg5TpkogOW6xeeNQL3ZziLO9URM7haqN8Wrp=Wg@mail.gmail.com> <CAJm83bCbVzO3NNCbjTy+O_16T7DBeA7O6018WWGu_-GyuN-8UA@mail.gmail.com> <20190330152353.GH7706@roeckx.be> <alpine.DEB.2.20.1904011334490.13313@grey.csi.cam.ac.uk>
From: Martin Burnicki <martin.burnicki@meinberg.de>
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Date: Mon, 01 Apr 2019 15:02:36 +0200
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Subject: Re: [Ntp] Leap second draft
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Tony Finch wrote:
> Kurt Roeckx <kurt@roeckx.be> wrote:
>>
>> I'm not really sure what you mean here exactly. But I think that
>> for an insert, either the receive or transmit happening during
>> the leap second can cause problems if this extension is not used.
> 
> You need to allow a second either side as well, to allow for different
> ways of implementing the ambiguous timestamps.

This why currently ntpd sends leap bits "unsynchronized" (0x3) back to
clients for a short interval across the leap second.

I very much like this idea since the chance that a client even sees this
is very low, and if it should really happen then it doesn't hurt the
client, even if the client is not so sophisticated to handle the new EFs.

Martin
-- 
Martin Burnicki

Senior Software Engineer

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