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Disable “Router OS” flag on each device on the dude.
http://forum.mikrotik.com/t/dude-connects-to-ros-devices-every-minute-and-then-disconnects/138940/1
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Since you do not reveal the config, probably you install the dude agent or the dude itself also where is present the NTP.
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I understood that they were 2 different routers…
the same thing I wrote before applies,
If you don’t know why it connects where there is NTP, how can we know? Are we fortune tellers?
Put the complete export of the 243.2 configuration on the forum
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You have ptp, wireguard, eoip, etc. dozen of other devices can connect to the router where NTP server is used,
one of those can be natted and apparently is the router where NTP server is, but really can be anything.
And about this…
/ip firewall nat
add action=masquerade chain=srcnat dst-address=172.16.243.0/24 src-address=192.168.120.0/24
add action=masquerade chain=srcnat dst-address=192.168.120.0/24 src-address=172.16.243.0/24
So, analyze the traffic on connection tracking for discover the true address of the device natted from that router.
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Apparently we don’t speak the same language.
In my house a service does not identify the router, the service runs on the router,
so it is certainly not the NTP service that acts as a NAT, but the router on which the NTP runs.