ntp

[Matthew Seaman]

alexus wrote:
> this is my ntp.conf
> 
> su-3.2# cat /usr/local/etc/ntp.conf
> server 0.us.pool.ntp.org
> server 1.us.pool.ntp.org
> server 2.us.pool.ntp.org
> server 3.us.pool.ntp.org
> su-3.2# ntpq -p
>      remote           refid      st t when poll reach   delay   offset  jitter
> ==============================================================================
>  mx              .RMOT.          16 u    - 1024    0    0.000    0.000   0.000
> su-3.2#
> 
> this isn't the first time, but after a while my ntp stops working :(
> i dont know what to do...
> 
> any suggestions?

It's /etc/ntp.conf if you're using the ntpd that comes with the base
system in FreeBSD.  Unless you're running you own PPS clock or engaged
in developing NTP, there's much point in installing the ports version.

Even so, it seems you have a problem connecting to a remote NTP server.
Can you do the following:

First, choose one of the IPs returned from one of those pool.ntp.org
addresses:

% host 0.us.pool.ntp.org
0.us.pool.ntp.org has address 216.45.57.38
0.us.pool.ntp.org has address 64.22.86.210
0.us.pool.ntp.org has address 69.36.241.112
0.us.pool.ntp.org has address 69.56.251.238
0.us.pool.ntp.org has address 169.229.70.201

Then test that you can get NTP packets to and from between that machine
and your own by using ntpq(8):

% ntpq -p 216.45.57.38
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
+clock.via.net   .GPS.            1 u  698 1024  377    8.832    0.232   0.125
-timekeeper.isi. .GPS.            1 u 1915 1024  376    7.509    0.416  18.394
+clock.sjc.he.ne .CDMA.           1 u  109 1024  377   10.085    0.262   0.066
-nist1.symmetric .ACTS.           1 u   73 1024  377   13.380   -0.470   0.172
-rrcs-64-183-55- .GPS.            1 u  645 1024  377   25.310   -3.634   2.929
-rrcs-64-183-56- .GPS.            1 u  625 1024  377   13.364   -3.183   1.270
-nist1.aol-ca.tr .ACTS.           1 u  947 1024  377    9.860    3.786   0.029
-clock.isc.org   .GPS.            1 u   98 1024  377   10.025   -6.679   0.005
-gps.layer42.net .GPS.            1 u  113 1024  377   12.315    0.042   0.388
-gatekeeper.no-s .PPS.            1 u  662 1024  377   27.165    3.409  78.001
-nist1-sj.witime .ACTS.           1 u  675 1024  377    9.204    5.834   0.780
*clepsydra.dec.c .GPS.            1 u  867 1024  377    9.988    0.283   0.123
-time.nist.gov   .ACTS.           1 u  933 1024  377   33.453   -1.888   1.615
 ntp2.lax-noc.co 204.123.2.5      2 u  935 1024  377    0.122    0.467   0.015
 LOCAL(0)        .LOCL.           9 l   23   64  377    0.000    0.000   0.002

If you don't get output like this showing a list of reference servers
from any of the available addresses, then I'd suspect something like
over restrictive firewall rules blocking the traffic.  If you do get
a response then the problem is localised on your machine.  In which
case, try stripping out and NTP related ports you've installed,
configure the base system ntpd(8) and see if that works better for you.

	Cheers,

	Matthew

-- 
Dr Matthew J Seaman MA, D.Phil.                   7 Priory Courtyard
                                                  Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey     Ramsgate
                                                  Kent, CT11 9PW

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