Dynamic configuration for IPv4/IPv6 address mapping in 4over6 technology

The configuration for address mapping is an important process for IPv4-over-IPv6 (4over6) technology, which is the major scenario of IPv6 transition. However, it is not straightforward to use current configuration methods because they were only designed to solve part of the configuration scenario. In this paper, we first analyze the challenges of current configuration solutions. After that, we propose a dynamic configuration mechanism for address mapping based on the DHCPv4 over DHCPv6 (DHCP4o6) lease query. The boarder router device (BR) in 4over6 transition is able to obtain the IPv4/IPv6 heterogeneous lease of customer premises equipment (CPE) in bulk or in real-time with the help of our method. The lease will then be used to build the address mapping table. We implement the prototype system and verify it in a real 4over6 network at Tsinghua University. The results show that our mechanism satisfies the requirement of quick establishment of address mapping table when BR device is being initiated. Furthermore, our solution reduces the load of BR device comparing to current methods.