1.2. What's New in IPv6?
IPv6 is an evolution of IPv4. The protocol is installed as a software upgrade in most devices and operating systems. If you buy up-to-date hardware and operating systems, IPv6 is usually supported and needs only activation or configuration. Currently available transition mechanisms allow the step-by-step introduction of IPv6 without putting the current IPv4 infrastructure at risk.
Here is an overview of the main changes: