IPv6 transition mechanisms are technologies that facilitate the transitioning of the Internet from its initial (and current) IPv4 infrastructure to the successor addressing and routing system of Internet Protocol Version 6 (IPv6). As IPv4 and IPv6 networks are not directly interoperable, these technologies are designed to permit hosts on either network to participate in networking with the opposing network.
The Internet Engineering Task Force (IETF) conducts working groups and discussions through the IETF Internet Drafts and Requests for Comments processes to develop these methods. Some basic IPv6 transition mechanisms are defined in RFC 4213.
Read more about IPv6 Transition Mechanisms: Stateless IP/ICMP Translation, Tunnel Broker, 6rd, Transport Relay Translation, NAT64, DNS64, Dual-Stack Lite (DS-Lite), Implementations
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“There is not any present moment that is unconnected with some future one. The life of every man is a continued chain of incidents, each link of which hangs upon the former. The transition from cause to effect, from event to event, is often carried on by secret steps, which our foresight cannot divine, and our sagacity is unable to trace. Evil may at some future period bring forth good; and good may bring forth evil, both equally unexpected.”
—Joseph Addison (1672–1719)