[181384] in North American Network Operators' Group
Re: REMINDER: LEAP SECOND
daemon@ATHENA.MIT.EDU (Doug Barton)
Mon Jun 22 18:18:38 2015
X-Original-To: nanog@nanog.org
To: nanog@nanog.org
From: Doug Barton <dougb@dougbarton.us>
Date: Mon, 22 Jun 2015 15:18:14 -0700
In-Reply-To: <E1Z64IS-000HkZ-Oa@stenn.ntp.org>
Errors-To: nanog-bounces@nanog.org
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On 6/19/15 2:58 PM, Harlan Stenn wrote:
> Bad idea.
>
> When restarting ntpd your clocks will likely be off by a second, which
> will cause a backward step, which will force the problem you claim to b=
e
> avoiding.
>
> There are plenty of ways to solve this problem, and you just get to
> choose what you want to risk/pay.
You misunderstand the problem. :) The problem is not "clock skips=20
backward one second," because most of the time that's not what happens.=20
The problem is that most software does not handle it well when the clock =
ticks ... :59 :60 :00 instead of ticking directly from :59 to :00.
THAT problem is avoided by temporarily turning off NTP and then turning=20
it back on again when "the coast is clear." Most software can handle the =
"clock skips forward or backwards one second" problem fairly robustly,=20
and as Baldur pointed out by doing the reset in a controlled manner you=20
greatly reduce your overall risk.
Doug
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