I'm having irregular issues with the RUT240 gateway, I am trying to use the WAN port for network with mobile and wifi as fallback but frequently the gateway does not obtain an IP address from DHCP at boot and will remain in that state until it is powered off and on.
Here are the logs dmesg output (github.com)
Have waited several hours when it's in this state and it remains in the same state (have tried replugging the WAN ethernet whilst in this state and nothing happens, not even any log messages). Have also tried setting a static IP and it still doesn't provide an internet connection.
I left the router powered on overnight and I came back to it this morning and it has an IP, but also have this error in the logs.
At this moment I would suggest re-flash your firmware to RUT2XX_R_00.01.14.4 via the bootloader menu: https://wiki.teltonika-networks.com/view/RUT2xx_Firmware_via_The_Bootloader_Menu
Please inform me if the unwanted behavior continues.