The RPi is running eth0 and usb over the same bus, which makes it a bad choice for rolling your own router. Other than the fun of understanding how the parts fi

The RPi is running eth0 and usb over the same bus, which makes it a bad choice for rolling your own router. Other than the fun of understanding how the parts fit together, I would be surprised if you could find a dev board that would outperform a dedicated router in terms of features and power consumption for a low price. Some of the RPi alternatives might be close, Banana Pi, Odroid, etc.