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 _______________________________________________ questions mailing list [email protected] https://lists.ntp.isc.org/mailman/listinfo/questions
