Controlling MCU-Based Robot via Ethernet Module Using MAC Address with Blocked Ports

Controlling an MCU-based robot over the internet via an Ethernet module is feasible if the microcontroller supports MAC and PHY layers, either integrated or external. For example, the PIC 18F67J60 MCU includes built-in MAC and PHY, requiring only the addition of a pulse transformer ("magnetics") and an Ethernet jack. MAC addresses must be globally unique and are essential for Ethernet communication. The challenge arises when broadband ISP blocks common ports like 80 (HTTP) and 23 (Telnet), limiting direct access methods such as port forwarding. Alternative approaches include using Wi-Fi modules with serial interfaces controlled by the MCU or specialized wireless modules like Digi International's XBee Wi-Fi. However, some designs require the robot to independently connect to the internet without relying on external network lines or power, complicating the solution. Using MAC addresses alone to bypass IP address changes is not a standard method for remote control over the internet.
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