Hi, ARP packets addressed to the Ethernut board (2.1) crashing the TCP stack using Nut O/S 4.0.2, 4.0.3 and 4.1.5 pre. I see from previous messages that this is not a new problem. Is anyone working on it? Regards, Lloyd. -- IT-afdelingen Pharma Nord Sadelmagervej 30-32 7100 Vejle Denmark Tel:. +45 75 85 74 00