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--- pc_engines_apu_ublox_6_timing_gps_ntp [2015/01/06 09:37] – [Verify] admin
+++ pc_engines_apu_ublox_6_timing_gps_ntp [2015/01/06 09:46] – [Install and configure NTPd] admin
@@ Line 83: / Line 83: @@
 # By default, exchange time with everybody, but don't allow configuration.
-restrict -4 default kod notrap nomodify nopeer noquery
+restrict -4 default limited kod notrap nomodify nopeer noquery
-restrict -6 default kod notrap nomodify nopeer noquery
+restrict -6 default limited kod notrap nomodify nopeer noquery
 # Local users may interrogate the ntp server more closely.
@@ Line 148: / Line 148: @@
 ====Verify====
+  * Make sure gpsd and ntpd start at boot. If not, enable it.<code>update-rc.d ntp enable
+update-rc.d gpsd enable</code>
+  * Test PPS reception. <code># ppswatch /dev/pps0
+trying PPS source "/dev/pps0"
+found PPS source "/dev/pps0"
+timestamp: 1403289214, sequence: 11, offset:  81613988
+timestamp: 1403289214, sequence: 11, offset:  81613988
+timestamp: 1403289215, sequence: 12, offset:  81607583
+timestamp: 1403289215, sequence: 12, offset:  81607583
+timestamp: 1403289216, sequence: 13, offset:  81609303
+timestamp: 1403289216, sequence: 13, offset:  81609303
+timestamp: 1403289217, sequence: 14, offset:  81601958
+^C</code>
+  * Check ntpq status. The 'o' means, PPS is working.<code>$ ntpq -p
+     remote           refid      st t when poll reach   delay   offset  jitter
+==============================================================================
+ ntp1.polaire.nl .PZF.            1 u   47   64    1    0.270   12.367   0.001
+ ntp2.polaire.nl 95.97.208.29     2 u   48   64    1    0.293   12.720   0.001
+ ntp3.home.polai .DCF.            1 u   47   64    1    0.300   13.941   0.001
+oPPS(0)          .PPS.            0 l    -   16    7    0.000   12.355   0.102
+*SHM(0)          .GPSd.           0 l    2   16    7    0.000    1.188   1.431
+# After a while...
+     remote           refid      st t when poll reach   delay   offset  jitter
+==============================================================================
++ntp1.polaire.nl .PZF.            1 u   56   64  377    0.292   -0.099   0.075
+-ntp2.polaire.nl 95.97.208.29     2 u   50   64  377    0.289    0.638   0.086
++ntp3.home.polai .DCF.            1 u   41   64  377    0.237    1.656   0.048
+oPPS(0)          .PPS.            0 l   15   16  377    0.000    0.027   0.003
+*SHM(0)          .GPSd.           0 l   16   16  377    0.000   -8.657   2.708
+</code>
   * Show connected clients:<code>ntpdc -c monlist</code>
   * Verify leap variables:<code>ntpq -c "rv 0"