The Transition to IPv6, Part 1: 4over6 for the China Education and Research Network

Researchers at the Tsinghua University in Beijing propose a mechanism for letting IPv4 networks communicate with each other across an IPv6 backbone via a Border-Gateway Protocol (BGP)-based control plane for advertising tunnels and IPv4 network prefixes. They've deployed a prototype implementation on the native-IPv6 China Education and Research Network 2 (CERNet2) backbone as the major part of the China Next-Generation Internet (CNGI) project, using current packet encapsulation technology and an extension of BGP, and the IETF is currently considering their 4over6 mechanism as well.