Internet Protocol, Version 6 (IPv6) Specification
RFC 1883
Document | Type |
RFC - Proposed Standard
(December 1995; No errata)
Obsoleted by RFC 2460
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Authors | Steve Deering , Bob Hinden | ||
Last updated | 2013-03-02 | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 1883 (Proposed Standard) | |
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | (None) | ||
Send notices to | (None) |
Network Working Group S. Deering, Xerox PARC Request for Comments: 1883 R. Hinden, Ipsilon Networks Category: Standards Track December 1995 Internet Protocol, Version 6 (IPv6) Specification Status of this Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited. Abstract This document specifies version 6 of the Internet Protocol (IPv6), also sometimes referred to as IP Next Generation or IPng. Deering & Hinden Standards Track [Page 1] RFC 1883 IPv6 Specification December 1995 Table of Contents 1. Introduction..................................................3 2. Terminology...................................................4 3. IPv6 Header Format............................................5 4. IPv6 Extension Headers........................................6 4.1 Extension Header Order...................................8 4.2 Options..................................................9 4.3 Hop-by-Hop Options Header...............................11 4.4 Routing Header..........................................13 4.5 Fragment Header.........................................19 4.6 Destination Options Header..............................24 4.7 No Next Header..........................................25 5. Packet Size Issues...........................................26 6. Flow Labels..................................................28 7. Priority.....................................................30 8. Upper-Layer Protocol Issues..................................31 8.1 Upper-Layer Checksums...................................31 8.2 Maximum Packet Lifetime.................................32 8.3 Maximum Upper-Layer Payload Size........................32 Appendix A. Formatting Guidelines for Options...................33 Security Considerations.........................................36 Acknowledgments.................................................36 Authors' Addresses..............................................36 References......................................................37 Deering & Hinden Standards Track [Page 2] RFC 1883 IPv6 Specification December 1995 1. Introduction IP version 6 (IPv6) is a new version of the Internet Protocol, designed as a successor to IP version 4 (IPv4) [RFC-791]. The changes from IPv4 to IPv6 fall primarily into the following categories: o Expanded Addressing Capabilities IPv6 increases the IP address size from 32 bits to 128 bits, to support more levels of addressing hierarchy, a much greater number of addressable nodes, and simpler auto-configuration of addresses. The scalability of multicast routing is improved by adding a "scope" field to multicast addresses. And a new type of address called an "anycast address" is defined, used to send a packet to any one of a group of nodes. o Header Format Simplification Some IPv4 header fields have been dropped or made optional, to reduce the common-case processing cost of packet handling and to limit the bandwidth cost of the IPv6 header. o Improved Support for Extensions and Options Changes in the way IP header options are encoded allows for more efficient forwarding, less stringent limits on the length of options, and greater flexibility for introducing new options in the future. o Flow Labeling Capability A new capability is added to enable the labeling of packets belonging to particular traffic "flows" for which the sender requests special handling, such as non-default quality of service or "real-time" service. o Authentication and Privacy Capabilities Extensions to support authentication, data integrity, and (optional) data confidentiality are specified for IPv6. This document specifies the basic IPv6 header and the initially- defined IPv6 extension headers and options. It also discusses packet size issues, the semantics of flow labels and priority, and the effects of IPv6 on upper-layer protocols. The format and semantics of IPv6 addresses are specified separately in [RFC-1884]. The IPv6 version of ICMP, which all IPv6 implementations are required to include, is specified in [RFC-1885].Show full document text