NTP

To query a NTP server, use the ntpdc command.

NTP Monlist

To see the peers of the local server, run:

ntpdc -c monlist

You can also try querying a remote server by running:

ntpdc -c monlist IP

NTP Peers

To see the peers of a server, run:

ntpq -pn

NTP Synchronization

To sync with a server, run:

ntpdate 136.159.5.75

You can get debug information with the -dv option:

ntpdate -dv 136.159.5.75

Troubleshooting

Server dropped: strata too high

136.159.5.75: Server dropped: strata too high
server 136.159.5.75, port 123
stratum 16, precision -22, leap 11, trust 000
refid [136.159.5.75], delay 0.02577, dispersion 0.00002
transmitted 4, in filter 4
reference time:    00000000.00000000  Sun, Dec 31 1899 16:26:08.000
originate timestamp: d7a8d436.b9474d41  Wed, Aug 27 2014 16:03:34.723
transmit timestamp:  d7a8d448.c3f0311e  Wed, Aug 27 2014 16:03:52.765
filter delay:  0.02588  0.02577  0.02582  0.02582 
         0.00000  0.00000  0.00000  0.00000 
filter offset: -18.0417 -18.0417 -18.0417 -18.0417
         0.000000 0.000000 0.000000 0.000000
delay 0.02577, dispersion 0.00002
offset -18.041794

Server dropped: Leap not in sync

136.159.2.251: Server dropped: Leap not in sync
server 136.159.2.251, port 123
stratum 1, precision -9, leap 11, trust 000
refid [NTP], delay 0.02748, dispersion 0.00070
transmitted 4, in filter 4
reference time:    d7a64b67.11374bc6  Mon, Aug 25 2014 17:55:19.067
originate timestamp: d7a8d4ab.fae147ae  Wed, Aug 27 2014 16:05:31.980
transmit timestamp:  d7a8d4ba.f4c9d0fb  Wed, Aug 27 2014 16:05:46.956
filter delay:  0.02831  0.02748  0.02757  0.03752 
         0.00000  0.00000  0.00000  0.00000 
filter offset: -15.0758 -15.0762 -15.0761 -15.0711
         0.000000 0.000000 0.000000 0.000000
delay 0.02748, dispersion 0.00070
offset -15.076202