Full Text:   <1831>

Summary:  <1490>

CLC number: TP393

On-line Access: 2015-08-04

Received: 2015-01-14

Revision Accepted: 2015-05-06

Crosschecked: 2015-07-15

Cited: 1

Clicked: 7836

Citations:  Bibtex RefMan EndNote GB/T7714


Guo-liang Han


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Frontiers of Information Technology & Electronic Engineering  2015 Vol.16 No.8 P.634-645


A scalable and efficient IPv4 address sharing approach in IPv6 transition scenarios

Author(s):  Guo-liang Han, Cong-xiao Bao, Xing Li

Affiliation(s):  CERNET Center, Tsinghua University, Beijing 100084, China

Corresponding email(s):   guoliang.taurus@gmail.com, congxiao@cernet.edu.cn, xing@cernet.edu.cn

Key Words:  IPv6 transition, Carrier-grade NAT (CGN), A+P, Address sharing, Dynamic switching

Guo-liang Han, Cong-xiao Bao, Xing Li. A scalable and efficient IPv4 address sharing approach in IPv6 transition scenarios[J]. Frontiers of Information Technology & Electronic Engineering, 2015, 16(8): 634-645.

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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 sharing 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.

Authors propose an hybrid approach for assigning IPv4 addresses/ports to customers in environments with limited availability of IPv4 addresses. They show how the proposed technique inherits the advantages of two known techniques (A+P and CGN) that they combine. The studied area does not receive sufficient academic attention, but is of critical importance for the future of the Internet: the question of how to address the IPv4 address shortage. The authors have excellent technical knowledge and are known in the IETF, the internet standardisation body, for their high-quality work. The area they address in this paper is very challenging, but the authors communicate a complex topic very well, and the results are interesting.




Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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