Hello,
I have tested the configuration steps provided in my previous comment with the RUT2_R_00.07.02.2 firmware, but the port does work as a LAN port, thus, I advice to double check the instructions and make sure you save the settings after each change made.
Otherwise, I would need more details on what exactly is not working for you and what are the steps that you take?
Best regards,
Žygimantas