Smarmengol,huh? Well, thanks for the advice. I'll give it a try later but first, let's deal with the matter about the Ethernet Shield...
I've already tried to adapt the Arduino Ethernet Shield for Uno/Mega to the Nano (i both tried through ICSP and SPI pins), without any success... (The "no hardware" error)... Although the shield is working properly on Arduino Mega... Now that you're saying it should work, i may have done it wrong... Can you help me?