@joquer
in another topic i've read that you do your communication to the arduino using a .NET-application.
Because my efforts are the same (actually i'm using the serial communication via USB) and i was searching a solution to use ethernet. I simply tried your listing above (adjusted to my IP-range ) but no .NET approach was able to connect to the ethernet shield.
The serial port delivered the correct XML statements. Pinging was no problem and the firewall was switched off.
I'm using the "official Ethernet shield" with Wiz5100 and an Arduino with Atmega328. The Arduino release is 15.
Could you tell me your secret?
Thanks Klaus