[ntp:questions] NTP driving me nuts!

Danny Mayer mayer at ntp.isc.org
Wed Dec 27 18:06:14 UTC 2006

JCA wrote:
>    I have three Linux boxes, A, B and C, running ntpd. C gets its
> synchronization from some external, stratum 2 server, whereas A and B
> get their synchronization from C, as a stratum 3 server.
>    This setup has been working fine for months. A couple of days ago I
> noticed that A and B did not seem to be in sync any more. I restarted
> ntpd in A and B, making sure that A and B were synchronized with C by
> hand before. They both started fine but, surely enough, they did not
> seem to be keeping up with C - the local clocks on A and B started to
> diverge as though ntpd were not running at all.
>    C is reachable from A and B without any problems. In turn, C stays
> synchronized with the external server all right - always within 0.05
> seconds. Nothing has changed in A, B and C within the last few months.
> I just can't understand why, all of a sudden, A and B are no
> synchronizing with C at all.
>   How can one even begin to diagnose this problem? ntpd on A and B is
> not dumping any information to my logs. In particular, the "time
> reset" messages are absent. For all practical purposes, it is as
> though it were not running at all on those two boxes - however,
> synchronizing by hand with C by means of ntpdate works fine on both A
> and B.
>    Any ideas, anyone?

Not without any information. post the output of ntpq -p A B C so we can
see at least whether at least they are synchronized.


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