[ntp:questions] New years glitch?

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Thu Jan 3 21:42:03 UTC 2013

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.

I think there are some really old flavors of NTP in the pool?
 and different flavors of NTP behave differently.
 {Not to mention how their kernels may behave with leap seconds.}


 Some  (many? most?) of the related issues have been dealt with in
  more recent versions of NTP <http://archive.ntp.org/ntp4/ChangeLog-dev>
 <bugs.ntp.org/buglist.cgi?bug_status=__all__&content=Leap Second&query_format=specific&order=bug_id DESC>

  e.g. 4.2.6 requires a majority of survivors have the leap bit set to propagate

  Using the NIST Leap Second File, (NTP Versions before 4.2.6), (and newer)

The discussion has come up before in the last few months:

Ignore leap second announcement on NTP

leap second status/action items for Sept 1

Leap-second flag not forwarded to NTP clients

WARNING: someone's faking a leap second tonight

Leap second preparedness

How to insert a leap second with ntpq

NTP and Leap Second testing (update)

Leap Second testing

... and many more threads I'm sure

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