ntp question

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# 1  
Old 09-15-2011
ntp question

my server ntp point to 2 ntp servers; however, their clock are not sync due to mistake.

I found it is interesting that my server sync both time servers in round-robin, that +47s and -47 per ~10 mins

why sync in round-robin? not take the prefer one


# ntpq -pn
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================     .LOCL.          10 l   50   64  377    0.000    0.000   0.001
+    .LOCL.    4 u  827 1024  377    1.149   -8.256   3.874
*    .LOCL.    4 u  366 1024  377    1.165  47005.0   5.302

Last edited by pludi; 09-15-2011 at 07:45 AM..
# 2  
Old 09-15-2011
The simple answer is: one time server is not REALLY preferred. If ntp has access to multiple servers it samples all of them, trying to get the best estimate of current time.

Google for "ntp algorithm" if you want details.

And. Fix your timeservers. +/- 47s is bad in a production environment. Just ask your legal dept.
# 3  
Old 09-15-2011
Also both time servers are at stratum 4 which implies your timeserver is at stratum 5. You really should try and find time servers will at least 1 lower stratum and less delay.
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