The Internet is one of the greatest revolutionary innovations of the twentieth century. It made the 'global village Utopia ' a reality in a rather short span of time. It is changing the way we interact with each other, the way we do business, the way we educate ourselves and even the way we entertain ourselves. Perhaps even the architects of Internet would not have foreseen the tremendous growth rate of the network being witnessed today. IPv6 is sometimes also called the Next Generation Internet Protocol or IPng. IPv6 was recommended by the IPng Area Directors of the Internet Engineering Task Force at the Toronto IETF meeting on July 25, 1994 in RFC 1752, The Recommendation for the IP Next Generation Protocol. The recommendation was approved by the Internet Engineering Steering Group and made a Proposed Standard on November 17,1994. The core set of IPv6 protocols were made an IETF Draft Standard on August 10, 1998.