Both the Ethernet Shield and the Ethernet Board comes with a unique MAC address printed on a sticker. Is this the only place it is or is it also present in the W5100 chip? If so, how can I get it in code? Or do I really have to manually type it into my sketch file? The Ethernet.begin takes at minimum the MAC address as input.
The latter is very inconvenient as I plan on using several Arduinos on the same network.