[ntp:questions] Ntp not syncing after powerfail of server

Steve Kostecke kostecke at ntp.org
Thu May 19 17:39:45 UTC 2011

On 2011-05-19, M. Giertzsch <mgiertzsch at mobotix.com> wrote:

> This is of course true, I can't say that that one server serves the
> correct time. But in a closed environment I can't guarantee that even
> when using more servers. If real time is needed I'm in need of a GPS
> module or something like this.

The GPS gives you something more important than the "real time". It
gives you a stable time reference.

Without a stable time reference ntpd can't make your clocks tick at 1
second per second. At best you'll have all you clocks playing follow the
leader (chasing your drifting LAN time server).

> But hmm, still it seems to me that the client does not sync when
> finished booting before the server does. What about that iburst
> mentioned in my recent post and may it be that I have to be more
> patient waiting for the next poll (but I waited half an hour).

Try removing the Undisciplined Local Clock lines from the client (the
lines containing 127.127.1.*). I suspect that your clients are choosing
"LOCAL" as their sys_peer and then ignoring your LAN time server).

The Undiscplined Local Clock is not a back-up for "leaf-node" (i.e.
client only) systems. It is only appropriate for an ntpd which must be
able to server time to others when the real time sources are
unreachable, or don't exist.)

Steve Kostecke <kostecke at ntp.org>
NTP Public Services Project - http://support.ntp.org/

More information about the questions mailing list