[ntp:questions] Re: Leap second hangover?

David J Taylor david-taylor at blueyonder.co.not-this-bit.nor-this-part.uk
Sat Jul 1 15:08:11 UTC 2006

David Malone wrote:
> "David J Taylor"
> <david-taylor at blueyonder.co.not-this-bit.nor-this-part.uk> writes:
>> On both problem PCs, at 01:00 a positive leap second is inserted.
>> Arrgh!
> Interesting stuff - after the last leapsecond there were stuff
> public time servers advertising a pending leapsecond 12 hours later.
> Evidently there were some still advertising it a whole 6 months
> later!
>> All my systems are using the server ntp2c.mcc.ac.uk, so I presume
>> that is not is sending out the spurious message.  How can I find out
>> if a server is sending out a leap-second required message?  I can
>> only assume something in the UK pool of servers was incorrectly
>> sending the leap-second message, and may still be.
> You can see the leap bits by doing something like:
> ntpq -c rv localhost
> (replace localhost with the name of the host you want to query)
> and look for the "leap=" value. It should be "00" at the moment.
> I used this to produce the graph at:
> http://www.maths.tcd.ie/~dwmalone/time/leap2005.html#ntpleapflag
> It would be interesting to survey the pool servers and see which
> are advertising a leap second.
> David.

Thanks, David.  Well, I can see that neither Manchester not my simple 
stratum-1 server is advertsing leap-seconds.  Persumably some in the UK 
pool still are (or were).

Perhaps you can use your program to check?


More information about the questions mailing list