Implementation And Integration Of A Variety Of IPv4/v6Transition Protocols

In recent years, IPv6technology has been developed well and rapidly. It has shown obvious advantages in address capacity, safety, network management, mobility and QoS (Quality of Service) compared with IPv4technology. Gradually, IPv6has been seen as one of the core standard of next generation’s network protocols. Due to the incompatibility between IPv4and IPv6protocols, transplantation based on IPv4to IPv6works slowly. To solve this problem, scholars both in China and abroad have developed dual-stack technique, tunnel technique, translation technique and so on which are quite successful. Based on these techniques, some transition agreements have been brought into being which in a certain extent achieve the network interconnection and improve the utilization rate of IPv6network. However, since the association between each transition agreement is poor and application environment is without diversity, these technologies cannot be applied to the current complex conditions of network environment effectively.According to the above background, combining the advantages and application scenarios of various Internet based technologies, a unified system of conversion technology agreement is presented which integrates a variety of transition agreements. The system is proved to be effective under actual application scene tests which are also contained in this thesis.First of all, this thesis researches IPv6protocol and compares it with IPv4protocol. Then it introduces three schemes of IPv4/v6transition used both in China and abroad, dual stack technology, tunnel technology and translation technology. Analysis of the advantages and disadvantages of each technology and different selection schemes under various environments are also presented.In the second place, this thesis proposes a unified system for IPv4/v6transition agreements and illustrates the design and its whole structure. When data packet enters the kernel and needs to be forwarded, according to differences based on virtual device techniques, it will be send to corresponding transition agreement module for further processing by particular router. This will make the unified system available for more network environments and able to choose appropriate transition agreement for current status. AFTR module, NAT64module and IVI module are also re-designed on the unified system based on three main transition agreements’definition.In the third place, various transition agreements are fused in this thesis through the unified system and the re-implementation of each transition agreement module. It gives clients a set of configuration commends with a unified form to solve possible conflicts between clients and to make the utilization of IPv6network faster and more thorough.At the end, the unified system is tested in term of function consistency and connectedness. It is verified whether DS-Lite, IVI, NAT64and other transition agreements’main function modules meet the requirements. The experiment results and issue analysis are also presented.