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 next generation IP protocol. Started in 1991, the specification was completed in 1997 by the Internet Engineering Task Force (IETF). IPv6 is backward compatible with and is designed to fix the shortcomings of IPv4, such as data security and maximum number of user addresses. Virtually Unlimited Addresses IPv6 increases the address space from 32 to 128 bits, providing for a virtually unlimited (for all intents and purposes) number of networks, servers and devices (see Internet of Things). It also supports quality of service (QoS) parameters for real-time audio and video. Originally called "IP Next Generation" (IPng), IPv6 is slowly replacing IPv4, with the two existing side-by-side for several years. IPv6 was officially deployed in July 2004 when ICANN added IPv6 records to its DNS root server for the .jp (Japan) and .kr (Korea) country codes. What Happened to IPv5? IPv5 was an experimental streaming audio/video protocol, which had nothing to do with the fundamental structure of IP addressing. See IPv4 address exhaustion and IP address.