The Study Of Campus Network Going Up And Performance Measurement Based On IPv6

After the birth of the Internet based on the IPv4over forty years ago, such primaryproblems as the address shortage and the Internet security are gradually turning up.Therefore, the IPv6is going to serve as the core protocol for the world’s next-generationInternet because it is more extensive, faster, safer, and timelier than the IPv4. As the“engine” to drive the global development of the IPv6, China has constructed the largestsole IPv6experimental network backbone in the world---the second generation ofChina Education and Research Network-CERNET2, which materializes the high-speednext-generation Internet IPv6access of100-plus key colleges&universities andscientific institutions throughout China, and the IPv6users have outnumbered1million.The campus network within colleges and universities is an indispensableinformation infrastructure. In the campus network, the IPv4works as the “productionnetwork” to provide teachers and students with information of teaching, scientificresearch, etc., while the IPv6is the “research network” to try the new networktechnology for the scientific research. On the basis of the research on the currentdevelopment of the IPv6both nationally and internationally, the course, the strategy, etc.involved in the evolution of the IPv4to the IPv6are to be intensively analyzed, and thecritical problem, the strategy and the feasible technology in the upgrade of the campusnetwork to completely support the IPv6are to be systematically summarized andclarified. Here Chongqing University which uses a10G IPv4/IPv6dual-stack network istaken as an example. The traffic of the IPv6has outstripped that of the IPv4, and thecore network backbone adopting the dual-link and dual-homing access technology routerealizes the redundancy structure of the equipment and the link level and ensures thestability of the network. The dual-stack network employs the OSPF routing protocolcomprehensively, which is directly enabled between the nodes of the core layer, andvarious areas are divided into for the convergence speed of the route. The IPv6networkplans the main address convergence according to the geographic location to facilitatethe fault location and the quick positioning. The running support systems of the networkmanagement, the safety supervision, the authentication charging, etc. are to be promotedto guarantee the manageability, controllability and safety of the upgraded campusnetwork. A high-speed sole IPv6network will be constructed for the high-performancecalculation, cloud technology, scientific research, and IPv6experimental study. The “IPv6access priority” of users is achieved by the establishment of the IPv4/IPv6dual-stack DNS domain name resolution system and the utilization of the BINDmechanism allocated to the domain name.For the IPv4/IPv6dual-stack network, assessing the stability and reliability of thetwo networks operating simultaneously in a scientific way depends uponcorrectly-measured data like delay, rate of request timed out and bandwidth whichindicate the operation and performance of the networks. In this way, the recent twoyears’ actual operation data of the IPv4/IPv6dual-stack network of ChongqingUniversity are collected, including the access, the convergence, and the delay and rateof request timed out of the network backbone. Meanwhile, the new characteristics of theIPv6message are utilized to create a new usage of its extension header and undefinedextended field. Then a mixing measurement model of the delay and rate of requesttimed out of the IPv6network is brought forward and designed, and a prototype systemis developed so as to make a deployment within a certain scope in the IPv4/v6network.The comparison with the actual data demonstrates that the model designed on theutilized new characteristics of the IPv6message is reasonable and scientific, which canfacilitate improving the accurate measurement of the delay and rate of request timed outof the IPv6network.The network bandwidth is a key indicator for the usage of the network. By virtueof relatively thorough understanding and analysis of the basic measurement principle ofthe network bandwidth, an analogy between the typical bandwidth measurement model,algorithm and method is carried out. Then an improved algorithm is presented for theone-way bandwidth measurement of the IPv6-based unequal-packet-pair subtraction, onthe basis of the systematically-analyzed and researched IPv6’s new characteristics, thebasic bandwidth measurement principle, as well as the packet pair bandwidthmeasurement algorithm. In addition, as for the ordinary tunnels and the interconnectionmechanism during the long evolution from the IPv4to the IPv6, the algorithm isprocessed. As a result of the improved algorithm, the number of the detection groups isreduced, the impact imposed by data packet queuing is weakened and the routesymmetry caused by the return trip is avoided. Through further understanding of theIPv6, a plan is designed to achieve the IPv6-based algorithm and the strict path controlfor message sequence measuring is also realized by innovative adoption of the flowlabel of the IPv6header. Finally it turns out that the improved algorithm is scientific andreasonable through algorithm stimulation and confirmation on the specialized network simulation software, OPNET.