[ntp:questions] New years glitch?

steven Sommars stevesommarsntp at gmail.com
Tue Jan 1 12:19:31 UTC 2013


For the past 6 months a number of NTP servers have been reporting leap=01.
 When 2013 began I saw a 1 second jump from NTP servers at University of
Minnesota, Apple, and a few other sites.

To my knowledge the underlying issue in ntpd has not been addressed.




On Tue, Jan 1, 2013 at 12:29 AM, David Taylor <
david-taylor at blueyonder.co.uk.invalid> wrote:

> On 01/01/2013 06:12, s.schaefer.at.acm at gmail.com wrote:
>
>> I'm using [0123].ntp.pool.org with my two internet accessing NTP
>> servers.  I missed the ball drop on new years because I was trying to
>> figure out why Nagios was complaining about my NTP servers dropping the two
>> internet accessing daemons and prefering each other, resulting in higher
>> and higher strata numbers.  My first reaction was to restart all these
>> non-internet accessing daemons, assuming they'd reset to the two
>> internet-accessing daemons, then honor the low stratum numbers and be sane.
>>
>> Then I noticed my two internet accessing daemons were reporting that they
>> were within milliseconds of their internet peers (multiple cnames sending
>> them to a non-overlapping set of real servers), BUT almost exactly one
>> second different from each other.  I first noticed this at a little after
>> midnight, but it went away by about 00:40 - I don't have status logs to say
>> exactly when.
>>
>> Huh?
>>
>
> My own plots show no glitch:
>
>   http://www.satsignal.eu/mrtg/**performance_ntp.php<http://www.satsignal.eu/mrtg/performance_ntp.php>
>
> Was something sending a Leap Second flag?  You could check with my program
> here:
>
>   http://www.satsignal.eu/**software/net.htm#NTPLeapTrace<http://www.satsignal.eu/software/net.htm#NTPLeapTrace>
>
> Recent versions of NTP should ignore a single leap-second flag, earlier
> versions may set a leap second even if only one of the upstream servers is
> indicating thus.
>
> Happy New Year and thanks to all those who have helped me in the past!
> --
> Cheers,
> David
> Web: http://www.satsignal.eu
>
>
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