[ntp:questions] LAN synch question

rochertov at gmail.com rochertov at gmail.com
Thu Sep 11 22:00:06 UTC 2008


Thank you for the responses.  I just have a few small clarification
questions.
I have used ntpdc and ntpq on the same machine that tries to synch
with an
ntp server (192.168.0.4).  The ntp server uses its own system clock
which is
not disciplined (need to figure out how to do that).  I am curious as
to why
the reported offsets are different.

ntpdc> peers
     remote           local      st poll reach  delay   offset    disp
==========================================================
=LOCAL(0)        127.0.0.1        5   64  377 0.00000  0.000000
0.03059
*192.168.0.4     192.168.0.20     6   16  377 0.00011  0.007474
0.02922

[root at term1 etc]# ntpq -p ntp
     remote           refid      st t when poll reach   delay
offset  jitter
==========================================================
 192.168.0.255   .BCST.          16 u    -   64    0    0.000
0.000   0.001
*LOCAL(0)        .LOCL.           5 l   51   64  377    0.000
0.000   0.001


Also, David, did you mean 100 nano-seconds or 100 micro-seconds?  I
would be
totally fine with 100 micro-seconds.  Would that be achievable if I
get a GPS
clock for the ntp server and keep the rest of the setup the same?
(These are
Linux 2.6.24 machines).  (an info about a cheap Linux compatible clock
would
be greatly appreaciated).

Many Thanks,




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