The invention of wheel was a major break throw of its scientific age. Like wise we can consider internet is the one of the most influential Scientifics break throw of current age, which was only possible because of advance ever growing communication technologies. Communication between any two sources protocols can be deemed as backbone of the whole setup. Currently several protocol exist and are employed in the cutting age of the communication set up. Different protocols are invented because of different scenario of communication. UDP protocol is actively used in today''s worlds of communication, in real time with data transfer which can tolerate little loss of data and accuracy. Because of ever increasing need and significance of communication system,in this book investigated the UDP software for Ethernet Lite in the embedded system by evaluated of behaviour of some important protocols UDP, IP, ICMP and ARP. One most important thing which we have done in this book that programme memory small as we can .The memory is 10KB with the UDP/IP.