摘要:This paper describes and analyzes the key issues underlying the design of the Internet Protocol version 6 (IPv6). The paper highlights gains made by the new design and analyzes possible weaknesses as well. This gives an overview of the features which will be available in IPv6, why they are included, and how they will be implemented. It discusses certain significant algorithms which will form part of the new design. Differences between IPv6 and the existing protocol, IPv4, have been pointed out wherever a newfeature has been introduced or an old one changed. The main focus of the paper is the provisions that the designers of IPv6 sought to make, which were not covered by IPv4. For this reason, issues like security, autoconfiguration and real-time communication have been dealt with in detail. Additionally, the address architecture of the new protocol has been explained, and changes in the formats and headers have also been discussed. Data fields have been described, where appropriate, to give a clearer picture of how messages will be structured under the new protocol.