The Research Of The Access From IPv4 To IPv6

In recent years, the rapid development of the Internet on the performance of the network has put forward higher requirements. Now widely used Internet protocol IPv4 has been difficult for the network to provide higher performance, because of the depletion of addresses, routing table expansion such as issues, In such circumstances, the next generation of IP protocol came into being IPv6. Compared with IPv4, IPv6 provides a huge address space, the flexible header formats, as well as enhanced options and reliable security, automatic address configuration, while supporting the allocation of resources.However, the upgrade of the Internet is a gradual process, not all overnight upgrade from IPv4 to IPv6. As IPv4 and IPv6 coexistence and the two IP protocol is not compatible, we will be faced with two separate networks, and other issues of mutual communication. For this, IETF proposed dual stack, tunnels, and protocol translation.This thesis focuses the visit needs of the Intranet, reference NAT-PT that proposed by IETF, presents a protocol translation mechanism which applying to Intranet, design and implementation a Translation Gateway.This thesis first discusses the IPv6 protocol, contrast with IPv4, it detailed analyses the data packet format of IPv6.And then introduces several transitional technology of IPv4/IPv6, for the characteristic of the application on Intranet, it uses NAT-PT technology. Next, the thesis expounds the principle and framework of the Translation Gateway. And then, introduces the translation algorithm and protocol translation module programming. The Translation Gateway framework is based on Netfilter of Linux.Through its own testing network, validation testing the Translation Gateway, that can supports the visit from IPv4 to IPv6 using domain names.Finally, it gives a summary of this paper, and point out the further work needs to be done.