Michael wrote:
Hi,
I have a real headache of a problem with NTP and clients failing to sync
with the server, so any
help will be greatly appreciated.
1)
I have a Linux solid state GPS based NTP server running NTP 4.2.......
It is rock steady. Server time offset is always < 1ms, usually much less and
the
jitter is usually less than .01 ms.
2)
I have many other Linux servers running Gentoo and NTP 4.2.....
3) Problem 1
If I tell these servers to sync directly to the GPS server as clients, they
do suceed, but then
they lose sync for a few minutes and then find it again etc etc. NTP reports
in /var/log/messages
that "No servers reachable", but I have sat there with tcpdump running
watching the UDP
request/responses ticking away with no problems whatsoever. No packets are
lost at all.
But NTP just doesnt seem to like whats going on.
However, if I make the client "burst" to the server, it never seems to lose
sync at all. Why I need
to use burst on a LAN when I cant see any packet loss, I dont know but it
seems to fix the problem.
4) Problem 2
Now, if I sync a server lets call it A, off the GPS server, then try to sync
the other servers off A, none
of them will sync at all even though NTP can see server A and ntpq reports a
reach of 377, the offset is
< 1ms and the jitter is < .01ms and tcpdump sees all the UDP
request/response packets without any problems.
So communication with the server appears to be fine, but NTP just doesnt
want to sync up at all.
Anybody got any ideas as to what is happening as I am going slowly mad.
regards
Michael
It might be helpful to post copies of your ntp.conf files and the output
of ntpq -p.
What command did you use to start ntpd; e.g. any options used?
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