Research Of QoS Based On IPv6

Since the TCP / IP architecture and protocol specification has been produced, it has become the most popular international interconnection. And the rapid development of the Internet shows that a great success the TCP / IP protocol has achieved.However, the development of the Internet's speed and size is far beyond the TCP / IP protocol ,which was expected to develop at the time,The pioneers in the development of the agreement never thought the Internet would be developed to such a scale, and still fast-growing, network has been closely related with people's lives and work. And data applications in the traditional basis, there are some higher requirements for network applications such as IP telephony, video conferencing, network management, these applications for the bandwidth, delay, packet loss rate, buffer zones and others have particular requirements. The old IP protocol has been unable to meet existing needs in this trend, the next-generation Internet protocol IPv6 QoS (Quality of Service-QoS) research is becoming increasingly important.The IPv6 QoS can achieve at different levels, and both can use the Diff-Serv, Int-Serv and IPv6 QoS Signaling-to-peer network services can also be specific to the realization of the network nodes, such as marking, queuing and congestion avoidance, these concrete measures. In this paper, the principals in this regard include the followings:1. IPv6 Flow Label: Flow Label in different network services in the design of different applications, mixed-flow label routing process.2. Edge Router access: DiffServ mapping algorithm, access control and packet scheduling.3. Active Queue Algorithm: The P-DRED algorithm, the original RED algorithm optimization and dynamic by setting the maximum threshold to distinguish between the different treatment groups priority to ensure high-priority and low packet marking / discard rate, in order to ensure the quality of its services. And improved algorithms and flow of the algorithm for the joint application of labels.4. Network simulation: Select NS2, in linux. According to the simulation needs, design the network topology, the language used to write Tcl scripts needed NS2 simulation. RED algorithm modified C++ procedures for P-DRED algorithm,recompile NS2.Awk script to deal with document tracking out.tr,the draw with Xgraph chart finally.