[time-nuts] Fake leap second ntp servers

[Maciej Żenczykowski]

Thanks I'll give that a try.

On Jan 31, 2008 7:58 AM, Jeff Mock <jeff at mock.com> wrote:

> There's probably a good NTP hacker hanging around on this list, but the
> best place to answer your question is probably the NTP hackers mailing
> list:
>
>    https://lists.ntp.org/mailman/listinfo
>
> jeff
>
> Maciej Żenczykowski wrote:
> > Hey folks,
> >
> > I just joined your email list to inquire about something which some of
> you
> > may have some knowledge of...
> >
> > I'm developing some code (for linux with an ntp server/client running),
> for
> > which I would like to verify that it handles positive (and negative)
> > leap seconds correctly (I need good time stamps for cross-machine
> > synchronization).
> > Obviously this is hard to do in practice due to the extreme rarity of
> these
> > events.
> > (even more so, considering my home servers running ntp apparently for
> some
> > reason saw leap seconds at the end of 2007...)
> > I've thought about switching to djb's suggestion of keeping a non-posix
> time
> > zone on the machines in question, but this
> > is not feasible because of existing legacy code...
> >
> > Thus I am curious to know if someone somewhere has perhaps set up fake
> ntp
> > servers which regularly insert and delete
> > leap seconds (ie. reset their time every couple days and randomly
> simulate a
> > positive or negative leap second 2-3 days
> > down the line).
> >
> > If not, does anyone know how to go about setting up such a fake ntp
> server
> > for testing purposes?
> >
> > Also, is there a known good list of ntp servers which are known to
> provide
> > correct leap second announcements (as mentioned above,
> > the stratum 1s at least 2 of my machines were synched to apparently
> > broadcast a leap second at the end of 2008).
> > I've heard horror stories about time synchronization going haywire the
> last
> > time there was a leap second and some upstream
> > ntp servers announced leap-seconds and others didn't (the time
> > mis-synchronization brought down the application)...
> >
> > Cheers,
> > Maciej.
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>
>
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