Hallo! I use the FreeRTOSlwIP Port for the LPC2368 (http://www.sirsydom.de/permalinks/MCB2300FreeRTOSlwIP.rar , originally from Yahoo Groups). So, this all works great, also ethernet and lwIP-Stack, but also while oerating at 10MBit. When im connected with 100Mbit, sending of packets to ethernet fails mostly. Recieving works perfectly, the IP-Stack processes packet right and gives it it to ethernet driver and the ethernetdriver works correct from my point of view.. There are no erros in the TX Status register. When I'm connected to a 100Mbit Hub, and i make a ARP-Request to a non-existant Eth-Addr, just the PC (sender) Port of the Hub is flashing. I think this means LED flashes only while sending, not recieving because ARP is Brodacast and IS revieved by the LPC2368. When i do a ARP Request on the LPC2368 MAC-Addr, both LEDs are flahsing. That means to me the LPC is sending something ON the Ethernet. But the PC is not recieving anything. Etherreal in prosmicous mode does not display anything but the initial ARP-Request. Some ideas???