On 16-04-2020 11:31, Hal Murray wrote: >> I could switch to a NMEA clock sans PPS and a dedicated PPS clock? > > That's what I would try.
So I went to: ##NMEA zonder PPS refclock nmea unit 0 mode 7 flag3 1 flag2 0 flag1 0 time1 0.00000006 time2 0.260 baud 4800 # ## PPS van dezelfde NMEA GPS refclock pps unit 0 flag2 0 A NMEA clock without, a PPS clock with PPS. (If I did that correctly) I also switches the two Garmin GPS18X's between this box and the firewall. On this workstation I see: $ ntpq -pn remote refid st t when poll reach delay offset jitter ============================================================================== xNMEA(0) .GPS. 0 l 18 64 377 0.0000 -331.787 23.4930 xPPS(0) .PPS. 0 l 7 64 377 0.0000 -0.8792 0.1323 +192.168.10.98 .GPS. 1 u 98 128 377 0.2679 -0.7279 0.1074 *fd00:c0a8:a00: .GPS. 1 u 126 128 377 0.2856 -0.5707 0.2049 2606:4700:f1:: .STEP. 16 1 - 512 0 0.0000 0.0000 0.0010 -2405:fc00:0:1: .PPS. 1 8 104 128 377 172.2620 1.3215 1.2845 -2001:470:e815: .PPS. 1 8 115 128 377 174.3298 -8.0867 1.0422 (cut) So I start to think the serial port might have an issue? The firewall shows: # ntpq -pn remote refid st t when poll reach delay offset jitter =============================================================================== oNMEA(0) .GPS. 0 l 40 64 377 0.0000 0.1373 0.0000 fd00:c0a8:a00:1 165.216.214.155 2 u 8 64 377 0.3301 0.9063 0.1030 192.168.10.70 165.216.214.155 2 u 55 64 377 0.2456 0.8751 0.0562 2606:4700:f1::1 .NTS. 16 4 - 256 0 0.0000 0.0000 0.0010 -2a01:3f7:2:202: 194.58.202.20 2 8 30 64 377 36.1680 2.4365 0.9056 #2a03:b0c0:1:d0: 37.15.221.189 2 8 43 64 377 23.1451 2.6572 1.8014 +2001:888:0:7::2 193.67.79.202 2 u 23 64 377 14.3002 3.6927 0.3338 (cut) (also with kernel discipline) This looks more normal? Udo _______________________________________________ devel mailing list devel@ntpsec.org http://lists.ntpsec.org/mailman/listinfo/devel