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This is a very simple project. The author will show how simple is to control things over the Internet using a few things like a Arduino Board, an Ethernet Shield and some LEDs. The arduino will emulate a Web Server and after receives some command will turn on or off the LED.
He also explains how you can configure the router. To connect to Arduinion from external network, you must set the port forwarding in the router.
Below is the webserver to control the LED connected to your Arduino.
You can get more detail including source code from instructables. (http://www.instructables.com/id/Ethernet-Shield-LED-WEB-SERVER/)
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