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Verify that NTP works correctly by running ntpq -p.

Under the st (stratum) column sould be at least one "1". This indicates a successful synchronization.

janis@cpm-MS-7A94:~$ ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
ntp1.rwth-aache .POOL. 16 p - 64 0 0.000 0.000 0.000
ntp2.rwth-aache .POOL. 16 p - 64 0 0.000 0.000 0.000
0.ubuntu.pool.n .POOL. 16 p - 64 0 0.000 0.000 0.000
1.ubuntu.pool.n .POOL. 16 p - 64 0 0.000 0.000 0.000
2.ubuntu.pool.n .POOL. 16 p - 64 0 0.000 0.000 0.000
3.ubuntu.pool.n .POOL. 16 p - 64 0 0.000 0.000 0.000
ntp.ubuntu.com .POOL. 16 p - 64 0 0.000 0.000 0.000
*ts-1.rz.rwth-aa .GPS. 1 u 281 512 377 0.486 -1.204 0.122
+ntp2.rwth-aache .GPS. 1 u 187 512 377 0.563 -1.082 0.139