About 21 hours ago I noticed that I had the last communication which went through my MTik device.
That communication was SMTP.
Since then, I failed to perform the following two types of communication:
* SMTP from LAN ports to WAN/Internet port.
* HTTP, i.e. accessing the web interface of MTik via Internet port.
Until about 21 hours ago, those communication types worked well for a long time (about two years if not more).
I tried to connect the MTik device directly to my computer (via MTik Internet or LAN ports), but it didn't acquire IP Address.
I tried setting a manual IP Address, but still communication didn't work.
During the attempt to connect to the MTik device via HTTP, using Wireshark I noticed that the device didn't reply at all (as if it disappeared from the network).
My MTik device is hEX RB750Gr3.
Note that I didn't upgrade the RouterOS version of the MTik device for a long time as well.
I performed Reset to the MTik device and uploaded a backup configuration (which obviously worked in the past),
but then I couldn't connect to the web interface of the MTik device.
I was connected to the LAN port of the Router and MTik was connected to the LAN port of the Router via a different port, yet Wireshark showed that the MTik device constantly uses ARP to ask who is the gateway/router.
I wonder what could be the reason of it?
Such a weird behavior, happened out of the blue.