NTP issue Continued

[Andrew.Bridgeman at corusgroup.com]

Information about the NTP issue continued.

I have run a few commands to try and find out why ntp is not working
correctly and the output of these commands are below. Could someone tell me
anything that jumps out at them as the potential issue i currently have.

P.s I have set it up so we have two servers to look at incase one is not
available. It seems to be polling OK but just does not change the time on
the ntp client for some reason.

Command  =  ntptrace -r 5 -d -v IP

DoTransmit(IP)
DoTransmit to IP
ReceiveBuf(IP, IP)
server IP, port 123
stratum 2, precision -6, leap 00
refid server1_name delay 0.00029, dispersion 0.00000 offset -0.010315
rootdelay 0.03125, rootdispersion 10.99594, synch dist 11.01157
reference time:      ca655261.636499dd  Thu, Aug  9 2007  9:44:17.388
originate timestamp: ca65541f.5343d541  Thu, Aug  9 2007  9:51:43.325
transmit timestamp:  ca65541f.55de0503  Thu, Aug  9 2007  9:51:43.335

DoTransmit(IP)
DoTransmit to IP
ReceiveBuf(IP, IP)
server IP, port 123
stratum 1, precision -6, leap 00
refid 'LOCL' delay 0.00011, dispersion 0.00000 offset -0.007780
rootdelay 0.00000, rootdispersion 10.93810, synch dist 10.93810
reference time:      ca641cc8.fbef9db2  Wed, Aug  8 2007 11:43:20.984
originate timestamp: ca65541f.54000000  Thu, Aug  9 2007  9:51:43.328
transmit timestamp:  ca65541f.55f9f01b  Thu, Aug  9 2007  9:51:43.335

Command ntpq -p

     remote           refid      st t when poll reach   delay
offset  jitter
==============================================================================

 Server1_name .LOCL.           1 u    3   64  377    0.199  -12.229   0.008
 Server2_name Server1_name     2 u    1   64  377    0.246  -15.424   0.421

Regards

Andrew Bridgeman

----- Forwarded by Andrew Bridgeman/UK/Corus on 09/08/2007 09:49 -----
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||   Andrew  |                                              |
||   Bridgema|           To:        redhat-list at redhat.com  |
||   n       |           cc:                                |
||           |           Subject:        NTP issue Continued|
||   08/08/20|                                              |
||   07 09:46|                                              |
||           |                                              |
|+-----------+----------------------------------------------|




I am still having problems getting 40 redhat machines to use ntp and
synchronise with our Windows 2003 Cluster. I have tried a couple of things
suggested by people but have had no luck in fixing the issue. It seems that
when I put either the IP of the cluster, the name of the cluster or the
fully qualified name of the cluster in the config files the ntp service
communicates with the Windows cluster straight away and all the machines
are synchronised OK. The problem comes when i leave them afterwards for an
hour or a day or even a week and look back at the time on the machines and
they are all different.

I read on the net that the communication used with ntp is UDP over port 123
and was wondering if i have  some kind of polling issue after the initial
start-up of ntp. Does anyone know more detail on how the ntp part works.
i.e How often does is poll the cluster server for the time or is there a
way of checking the communication on that port is working.

Any  help on this would be much appreciated.

Regards

Andrew Bridgeman


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