[ntp:questions] Unable to use SUSE Linux for time synchronization.

Steve Kostecke kostecke at ntp.isc.org
Fri Feb 9 20:42:56 UTC 2007

On 2007-02-09, sandy <sandypossible at gmail.com> wrote:

> I have problem when using SUSE Linux as time server. When I try to use
> linux as time server, Linux replies with LI leap indicator flags set
> to "alarm condition (clock not synchronized)". As per RFC 2030, as
> unicast mode is used, as LI is 3, the reply is getting rejected. My
> Linux time server is standalone system. It is not getting time synched
> with external source. Could this the be the reason ?

ntpd must be synchronized to _something_, even if it's just the
Undisciplined Local Clock, or LocalCLK, (i.e. 127.127.1.x), before it
can serve time to others.

The best source of time is a ref-clock or another time server which is
(ultimately) synced to a ref-clock. You may use remote time servers
from the NTP Pool (http://ntp.isc.org/pool or http://www.pool.ntp.org/)
or select servers from the Stratum-2 list (http://ntp.isc.org/s2 or
http://www.ntp.org/s2). You should use 4, or more, remote time servers.
You can use only 1 or 3, although that does not provide enough
redundancy). Do not, under any circumstances, use 2.

If your ntpd is not able to poll a real time source (either a local
ref-clock or a remote time server) then you will have to configure the
LocalCLK as follows:

fudge stratum 10

Then restart ntpd and wait ~5 to 8 minutes. Then your SNTP clients
should accept the time from your ntpd. You should see the following
'ntpq -p' billboard when ntpd is synced to only the LocalCLK:

  remote    refid    st t when poll reach   delay   offset jitter
*LOCAL(0)   .LOCL.   11 l   NN   NN  377    0.000   0.000   0.004
If are unable to synchronize to your ntpd, please post the following:

* Your 'ntpq -p' billboard
* Your /etc/ntp.conf file (without the comment lines)

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

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