IPv6 - Computer Definition
The IPv6 specification grew out of the efforts of the IPng (IP next generation) Working Group to define a successor protocol to IPv4. Specified originally in IETF RFC 1883 (1995), since replaced by RFC 2460 (1998), IPv6 overcomes many of the limitations of IPv4, most notably with respect to address space, integration of application level protocols, quality of service (QoS), and security.The total size of the IPv6 datagram, including the header, is increased beyond the IPv4 limit of 65,535 octets to support jumbo payloads. At a minimum, all network links must support a maximum transmission unit (MTU) of at least 1,280 octets. As indicated in Figure I-2, the IPv6 header is 40 octets, compared to the IPv4 header of 20 octets, and can be extended as necessary through optional headers associated with higher layer protocols such as Transmission Control Protocol (TCP) and User Datagram Protocol (UDP). In a departure from IPv4, the IP header and any extension headers associated with the datagram are in addition to the payload length.The IPv6 datagram contains the following fields:
(Internet Protocol Version 6) The latest generation of the IP protocol. The specification was completed in 1997 by the Internet Engineering Task Force (IETF) and first deployed in 2004 when ICANN added IPv6 records to its DNS root servers for Japan and Korea. IPv6 is backward compatible with IPv4 and was designed to fix its shortcomings, such as data security and maximum number of user addresses. Virtually Unlimited Devices IPv6 increases the address space from 32 to 128 bits, providing for all practical purposes an unlimited number of unique addresses for connection to the Internet (see Internet of Things and binary values). It also supports quality of service (QoS) parameters for real-time audio and video. Originally called "IP Next Generation" (IPng), IPv6 and IPv4 exist side-by-side. What Happened to IP Version 5? IPv5 was an experimental streaming protocol that was not involved with IP address space. See 6LoWPAN, IPv4 address exhaustion and IP address.