IPv4 and IPv6 will coexist for many years during the transition period from the traditional IPv4-based Internet to an IPv6-based Internet.DHTLayer,a novel IPv4/IPv6 transition mechanism based on Distributed Hash Table...IPv4 and IPv6 will coexist for many years during the transition period from the traditional IPv4-based Internet to an IPv6-based Internet.DHTLayer,a novel IPv4/IPv6 transition mechanism based on Distributed Hash Table(DHT) is presented in this paper.It can fully support IPv4 and IPv6 inter-operation.DHTLayer employs a DHT overlay to maintain the routing information between IPv4 and IPv6.It decouples path selection from packet delivery.In DHTLayer,the Looking-Up Route Path is responsible for selecting paths,and then the Delivering Process takes charge of delivering IP packets along the path selected above.Simulation results show that it is very effective and efficient.展开更多
IPv6 has been an inevitable trend with the depletion of the global IPv4 address space. However, new IPv6 users still need public IPv4 addresses to access global IPv4 users/resources, making it important for providers ...IPv6 has been an inevitable trend with the depletion of the global IPv4 address space. However, new IPv6 users still need public IPv4 addresses to access global IPv4 users/resources, making it important for providers to share scarce global IPv4 addresses effectively. There are two categories of solutions to the problem, carrier-grade NAT （CGN） and ＇A＋P＇ （each customer shaving the same IPv4 address is assigned an excluded port range）. However, both of them have limitations. Specifically, CGN solutions are not scalable and can bring much complexity in managing customers in large-scale deployments, while A＋P solutions are not flexible enough to meet dynamic port requirements. In this paper, we propose a hybrid mechanism to improve current solutions and have deployed it in the Tsinghua University Campus Network. The real traffic data shows that our mechanism can utilize limited IPv4 addresses efficiently without degrading the performance of applications on end hosts. Based on the enhanced mechanism, we propose a method to help service providers make address plans based on their own traffic patterns and actual requirements.展开更多
The paper briefly describes the necessity of introducing IPv6 into networks and the fact that IPv4 and IPv6 will coexist in operators' networks for a long time. It also introduces Dual Stack, Tunneling and Transla...The paper briefly describes the necessity of introducing IPv6 into networks and the fact that IPv4 and IPv6 will coexist in operators' networks for a long time. It also introduces Dual Stack, Tunneling and Translation technologies for the transition from IPv4 to IPv6 and their coexistence. Moreover, it makes a brief analysis of transition strategies of operators' networks to IPv6 networks.展开更多
基金supported in part by National High Technical Research and Development Program of China(863 Program)under Grant No.2009AA01Z210National Key Basic Research Program of China(973 Program)under Grant No.2009CB320504+1 种基金Guangdong Ministry of Education Industry-Academia-Research project under Grant No.2009B090300315supported by the special program for joint construction project of Beijing
文摘IPv4 and IPv6 will coexist for many years during the transition period from the traditional IPv4-based Internet to an IPv6-based Internet.DHTLayer,a novel IPv4/IPv6 transition mechanism based on Distributed Hash Table(DHT) is presented in this paper.It can fully support IPv4 and IPv6 inter-operation.DHTLayer employs a DHT overlay to maintain the routing information between IPv4 and IPv6.It decouples path selection from packet delivery.In DHTLayer,the Looking-Up Route Path is responsible for selecting paths,and then the Delivering Process takes charge of delivering IP packets along the path selected above.Simulation results show that it is very effective and efficient.
文摘IPv6 has been an inevitable trend with the depletion of the global IPv4 address space. However, new IPv6 users still need public IPv4 addresses to access global IPv4 users/resources, making it important for providers to share scarce global IPv4 addresses effectively. There are two categories of solutions to the problem, carrier-grade NAT （CGN） and ＇A＋P＇ （each customer shaving the same IPv4 address is assigned an excluded port range）. However, both of them have limitations. Specifically, CGN solutions are not scalable and can bring much complexity in managing customers in large-scale deployments, while A＋P solutions are not flexible enough to meet dynamic port requirements. In this paper, we propose a hybrid mechanism to improve current solutions and have deployed it in the Tsinghua University Campus Network. The real traffic data shows that our mechanism can utilize limited IPv4 addresses efficiently without degrading the performance of applications on end hosts. Based on the enhanced mechanism, we propose a method to help service providers make address plans based on their own traffic patterns and actual requirements.
文摘The paper briefly describes the necessity of introducing IPv6 into networks and the fact that IPv4 and IPv6 will coexist in operators' networks for a long time. It also introduces Dual Stack, Tunneling and Translation technologies for the transition from IPv4 to IPv6 and their coexistence. Moreover, it makes a brief analysis of transition strategies of operators' networks to IPv6 networks.
