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Re: [Ntp] Antw: Re: Finding leap-seconds.list

Martin Burnicki <martin.burnicki@meinberg.de> Tue, 13 November 2018 08:27 UTC

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To: Harlan Stenn <stenn@nwtime.org>, Hal Murray <hmurray@megapathdsl.net>
Cc: Warner Losh <imp@bsdimp.com>, ntp@ietf.org
References: <20181112204109.7383F40605C@ip-64-139-1-69.sjc.megapath.net> <7b868ffd-5202-98a4-1be0-91eb9f1f002b@nwtime.org>
From: Martin Burnicki <martin.burnicki@meinberg.de>
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Date: Tue, 13 Nov 2018 09:27:08 +0100
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Subject: Re: [Ntp] Antw: Re: Finding leap-seconds.list
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Harlan Stenn wrote:
> 
> On 11/12/18 12:41 PM, Hal Murray wrote:
[...]
>> I'm not sure what happens if ntpd has a valid leap-seconds file after it 
>> expires.
> 
> If the file was valid but has expired, it's no longer valid.

Just for completeness please note:

Only starting with v4.2.8, ntpd ignores a leap second file that has
expired, which is good behavior.

Up to v4.2.6 an expired file was anyway considered valid, and was accepted.

This could lead an ugly error if a valid leap second announcement was
received from upstream time sources but was ignored just because an
expired leap second file was available.

Martin
-- 
Martin Burnicki

Senior Software Engineer

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