IVIT: A core stateless IPV4/IPV6 transition mechanism combining translation and tunnel technologies

As a simple IPv4/IPv6 transition mechanism, IVI solves communication problems between IPv4 and NIVI IPv6 networks statelessly (IVI/ NIVI IPv6 network is image of Global IPv4 in IPv6 address family via 1∶1/1:N mapping rule respectively). However, it fails to support communication between IPv4 and non-NIVI IPv6 networks. Current transition technologies such as NAT-PT and NAT64 cannot solve the issue as well. This paper proposes IVIT mechanism, which solves the problem with translation at the edge and tunnel at the core. Merging features of both IVI and Tunnel technologies, IVIT selects CPE at the edge as translation location and utilizes tunnel to load data arrived at the core gateway with IVI address mapping format and 6 to 4 tunnel mechanism. It puts forward address mapping rules embedding IPv4 host´s address and CPE´s address into IPv6 address, and supports communication between a private IPv4 network and an IPv6 network. IVIT resolves global addresses´ shortness and routing scalability issues, and realizes stateless translation and end-to-end transparent communication. Compared with NAT-PT, IVIT has better function and performance with less impact on network, and the defects of IVIT are perfectly acceptable.