Velleman

Ethernet shield that allows you to build a simple web server with a Arduino Mega 2560 Microcontroller Rev3 (not included) Features an integrated MAC controller that supports both Unicast and Broadcast packets Uses the ICSP connector as a serial connection Data rates up to 10 Mbps 8 kB Transmit / Receive Packet Dual Port Buffer (programmable pattern up to 64-byte) Max clock speed 20MHz