Re: [PLUG] Re: ntp...how do I know it's working?

Mark M. Hoffman on 23 Mar 2004 01:38:02 -0000


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Re: [PLUG] Re: ntp...how do I know it's working?


* Mike Chirico <mchirico@comcast.net> [2004年03月22日 18:32:30 -0500]:
> Thank you. There is a "reject" on my system using the "as" command, but
> I assume that's normal when authentication is disabled. Comparing your
> "frequency" and "stablility" with the values on my server leaves to
> wondering if something isn't working correctly. It seems like I should
> have numbers here, but I'm still reading the documentation.
> 
> 
> ntpq> pe
> remote refid st t when poll reach delay offset
> jitter
> ========================================================================
> ======
> tock.usno.navy. 0.0.0.0 16 u - 64 0 0.000 0.000
> 4000.00
You're right, it's not working. A "*" in the first column means that the
client has decided to sync with that remote. It will take some time to
get to that point... within 5 minutes or so. E.g.
$ /usr/sbin/ntpq -pn
 remote refid st t when poll reach delay offset jitter
==============================================================================
*10.17.17.3 132.236.56.250 3 u 146 512 377 0.223 0.927 0.108
Also, the "reach" attribute (377) tells you that the remote has responded to
a client request successfully the last 8 times it tried. [1] The zero in
your case indicates a problem, perhaps with network connectivity or maybe
your firewall. Can you ping tock.usno.navy.mil (guessing the rest of the 
remote address from the chopped output above) ? I can ping it from here.
If you specify multiple remotes, your client will still only sync on one of
them (at a time). E.g.
$ /usr/sbin/ntpq -pn
 remote refid st t when poll reach delay offset jitter
==============================================================================
+128.4.40.12 128.4.40.10 2 u 433 1024 377 19.387 -2.408 1.430
+216.204.156.2 18.103.0.198 2 u 379 1024 377 51.334 -2.862 6.158
x128.59.59.177 128.59.39.48 2 u 374 1024 377 260.049 114.029 11.165
*132.236.56.250 192.5.41.209 2 u 230 1024 377 39.866 -2.086 1.155
x128.118.25.3 128.118.25.12 2 u 770 1024 377 52.560 149.626 10.798
-198.82.162.213 129.7.1.66 2 u 399 1024 377 26.832 0.381 0.113
In this case, the first two are "candidates", the 3rd and 5th are "false tickers",
and the 6th is an "outlyer". Btw, all the remotes in the second example are real
public servers. Try those as well.
Hope this helps; regards,
[1] Yeah, it's in octal. Good choice, that.
-- 
Mark M. Hoffman
mhoffman@lightlink.com
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