[ntp:questions] ntp linux daemon drift apart from Windows Net Time Server

DavidO davidproc at hotmail.com
Thu Jun 1 23:54:18 UTC 2006


Hi:
I am trying to synchronize a linux (ntp version 4) box to an NT server
(w32tm).
I set up the registry keys of my second unit as follows:
- The windows XP box is a server.
- The windows XP box takes time from: Public reliable external source.
(216.34.94.18, or time.windows.com).


Now, when I run the ntpd in my linux box, the unit receives packets
from the window box but it looks like the clock filter is rejecting the
packet and it does not update the linux box.
When running in ntpd -d, I get the following messages:

peer 192.168.10.246 event 'event_reach' (0x84) status 'unreach, conf, 1
event, event_reach' (0x8014)
clock_filter: n 1 off -0.030308 del 0.000562 dsp 7.945314 jit 0.000004,
age 1
transmit: at 3 192.168.10.35->192.168.10.246 mode 3
receive: at 3 192.168.10.35<-192.168.10.246 mode 4 code 1
clock_filter: popcorn 0.014093 0.000004
transmit: at 5 192.168.10.35->192.168.10.246 mode 3
receive: at 5 192.168.10.35<-192.168.10.246 mode 4 code 1
clock_filter: n 3 off -0.016215 del 0.000455 dsp 1.951198 jit 0.010030,
age 4
transmit: at 7 192.168.10.35->192.168.10.246 mode 3
receive: at 7 192.168.10.35<-192.168.10.246 mode 4 code 1
clock_filter: n 4 off -0.019382 del 0.000442 dsp 0.952176 jit 0.006629,
age 2
transmit: at 9 192.168.10.35->192.168.10.246 mode 3
receive: at 9 192.168.10.35<-192.168.10.246 mode 4 code 1
clock_filter: n 5 off -0.019382 del 0.000442 dsp 0.452689 jit 0.005798,
age 4
transmit: at 11 192.168.10.35->192.168.10.246 mode 3
receive: at 11 192.168.10.35<-192.168.10.246 mode 4 code 1
clock_filter: n 6 off -0.019382 del 0.000442 dsp 0.202959 jit 0.005381,
age 6
transmit: at 13 192.168.10.35->192.168.10.246 mode 3
receive: at 13 192.168.10.35<-192.168.10.246 mode 4 code 1
clock_filter: n 7 off -0.019382 del 0.000442 dsp 0.078081 jit 0.005284,
age 8
transmit: at 15 192.168.10.35->192.168.10.246 mode 3
receive: at 15 192.168.10.35<-192.168.10.246 mode 4 code 1
clock_filter: n 8 off -0.019382 del 0.000442 dsp 0.015671 jit 0.005454,
age 10

The dispersion, the jitter, and the offset levels start increasing.
When I run ntpq -p, it shows:

     remote           refid      st t when poll reach   delay   offset
jitter
==============================================================================
 192.168.10.246  207.46.232.189   3 u    5   64    3    0.437  -15.273
 4.956

The linux box can see the  windows box but the linux box NEVER
synchronizes with the other one.
After a while the linux start drifting apart.

I have been reading different articles and I have tried to modified ntp
configurations from both sides without any success. I will really
appreciate (it is really needed for my company) any help from anybody,

Thanks

David O.




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