I activated NTP server on the router (just enabled, no broadcast, multicast, manycast), the NTP client was already set up.
Now the problem is, that some devices are working (synchronizing) and some not.
Openmediavault v 3, 5 and 6 are working (debian based) - NTP client is set up through a GUI, I just enabled it and entered the IP of the router.
Meteohub is not working (very old Debian - etchnhalf), NTP client is set up through a GUI, I just enabled it and entered the IP of the router.
I've tried to dig a little deeper in the command line of the Meteohub.
ntpdate works only if I use the -u parameter (unprivileged ports)
ntpd doesn't work
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ntpq -pn 192.168.242.254
192.168.242.254: timed out, nothing received
***Request timed out
ntpq> peers
remote refid st t when poll reach delay offset jitter
==============================================================================
192.168.242.254 .INIT. 16 u - 64 0 0.000 0.000 0.000
Windows 10 (not in a domain) also don't work - timeout, but when I switch the address to a Windows DC it syncs successfully.
When I run w32tm /stripchart /computer:192.168.242.254 /dataonly /samples:1 /packetinfo The result look OK to me?
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Tracking 192.168.242.254 [192.168.242.254:123].
Collecting 1 samples.
The current time is 14.05.2023 17:08:28.
17:08:28, +00.1412267s
[NTP Packet]
Leap Indicator: 0(no warning)
Version Number: 1
Mode: 4 (Server)
Stratum: 2 (secondary reference - syncd by (S)NTP)
Poll Interval: 0 (unspecified)
Precision: -19 (1.90735æs per tick)
Root Delay: 0x0000.0306 (+00.0118103s)
Root Dispersion: 0x0000.05D0 (0.0227051s)
ReferenceId: 0x51191C7C (source IP: 81.25.28.124)
Reference Timestamp: 0xE80B7618CA8D79E1 (154265 15:00:40.7912213s - 14.05.2023 17:00:40)
Originate Timestamp: 0xE80B77ECD0CBB2F1 (154265 15:08:28.8156082s - 14.05.2023 17:08:28)
Receive Timestamp: 0xE80B77ECF504B3C3 (154265 15:08:28.9571030s - 14.05.2023 17:08:28)
Transmit Timestamp: 0xE80B77ECF51287C2 (154265 15:08:28.9573140s - 14.05.2023 17:08:28)
[non-NTP Packet]
Destination Timestamp: Roundtrip Delay: 536200 (+00.0005362s)
Local Clock Offset: 141226700 (+00.1412267s)
I thought it will be a simple job and I'm fighting it for several days already and I'm running out of ideas ...