Re: Chrony on Asus router - no reduction of offset

Does the noselect clause on the config statements for the servers have
anything to do with it?

On Sat, Jun 10, 2023, 14:09 Torsten Wolf <[email protected]> wrote:

> Hi,
>
> I am running chrony 4.3 on an Asus RT-AX86U Pro router which acts as
> server for my local network. No matter if I use
>
> a) remote ntp servers
> b) a network client Raspberry Pi with GPS module as sole server
> c) that Raspberry synchronised to the same publich servers as in a) as
> sole server
>
> the offset is always in the order of -160ms. I also tried makestep but
> it quickly wanders off to the usual offset. Shouldn't the offset be
> corrected towards zero? At least that is what's happening on the raspi
> for b) and c). Here is the config and some data. I played a bit with
> maxupdateskew and tried to poll the raspi more frequently for b) and c)
> but that did not reduce the offset. I also don't seem to have a loop as
> in my previous problem report...
>
> chrony.conf (for scenario c))
>
> # raspi
> server 192.168.1.105 iburst
>
> server zeit.fu-berlin.de iburst noselect
> server ptbtime1.ptb.de iburst noselect
> server ptbtime2.ptb.de iburst noselect
> server ptbtime3.ptb.de iburst noselect
> server times.tubit.tu-berlin.de iburst noselect
> maxupdateskew 15
> driftfile /opt/var/lib/chrony/drift
> dumponexit
> dumpdir /opt/var/lib/chrony
> pidfile /opt/var/run/chrony/chronyd.pid
> makestep 1.0 3
> rtcsync
> logdir /tmp/mnt/TRANSFER/Transfer/chrony
> log measurements statistics tracking
> allow 192.168.0.0/16
> # prevent raspi from polling
> deny 192.168.1.104
> deny 192.168.1.105
> broadcast 60 192.168.1.255
> local stratum 1
> logchange 0.5
>
>
> chronyc sources
> MS Name/IP address         Stratum Poll Reach LastRx Last sample
>
> ===============================================================================
> ^* 192.168.1.105                 2   6   377    33   -226ms[ -409ms] +/-
> 8215us
> ^? zeit.fu-berlin.de             1   6   377    52   -228ms[ -410ms]
> +/-   56ms
> ^? ptbtime1.ptb.de               1   6   377     7   -227ms[ -227ms] +/-
> 7441us
> ^? ptbtime2.ptb.de               1   6   377    17   -229ms[ -229ms] +/-
> 9255us
> ^? ptbtime3.ptb.de               1   6   377     4   -227ms[ -227ms] +/-
> 7839us
> ^? ns.tu-berlin.de               2   6   377     4   -227ms[ -227ms] +/-
> 8129us
>
> chronyc tracking
> Reference ID    : C0A80169 (192.168.1.105)
> Stratum         : 3
> Ref time (UTC)  : Sat Jun 10 18:02:37 2023
> System time     : 0.135086194 seconds slow of NTP time
> Last offset     : -0.174640983 seconds
> RMS offset      : 0.178150147 seconds
> Frequency       : 13.519 ppm slow
> Residual freq   : -2691.479 ppm
> Skew            : 1.982 ppm
> Root delay      : 0.015255394 seconds
> Root dispersion : 0.100952275 seconds
> Update interval : 64.3 seconds
> Leap status     : Normal
>
> chronyc sourcestats
> Name/IP Address            NP  NR  Span  Frequency  Freq Skew  Offset
> Std Dev
>
> ==============================================================================
> 192.168.1.105              44  19   46m  -2691.479    161.086    -91ms
> 242ms
> zeit.fu-berlin.de          48  21   50m  -2636.146    123.263    +17ms
> 218ms
> ptbtime1.ptb.de            57  25   60m  -2632.208    101.466    +45ms
> 232ms
> ptbtime2.ptb.de            54  23   57m  -2651.780    111.097    -18ms
> 234ms
> ptbtime3.ptb.de            55  24   58m  -2601.458    110.065   +114ms
> 233ms
> ns.tu-berlin.de            49  21   51m  -2600.763    126.308    +79ms
> 245ms
>
> chronyc ntpdata
> Remote address  : 192.168.1.105 (C0A80169)
> Remote port     : 123
> Local address   : 192.168.1.1 (C0A80101)
> Leap status     : Normal
> Version         : 4
> Mode            : Server
> Stratum         : 2
> Poll interval   : 6 (64 seconds)
> Precision       : -25 (0.000000030 seconds)
> Root delay      : 0.014679 seconds
> Root dispersion : 0.000671 seconds
> Reference ID    : C035676C ()
> Reference time  : Sat Jun 10 17:58:36 2023
> Offset          : +0.226437911 seconds
> Peer delay      : 0.000576439 seconds
> Peer dispersion : 0.000000198 seconds
> Response time   : 0.000195511 seconds
> Jitter asymmetry: +0.00
> NTP tests       : 111 111 1111
> Interleaved     : No
> Authenticated   : No
> TX timestamping : Daemon
> RX timestamping : Kernel
> Total TX        : 2707
> Total RX        : 2706
> Total valid RX  : 2706
> Total good RX   : 2705
>