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IP version 6 Geoff Huston Telstra October 2002 精品文档 IP Version 6 Background What is IPv6 Why IPv6 And a few IPv6 myths as well 精品文档 Background 1991 - 1993 January 1991 – IAB Architecture Review If we assume that the Internet Architecture will continue in use indefinitely then we need additional [address] flexibility Two problems: Growth in the inter-AS routing table Consumption of IP address space (noteably the Class B block) November 1991 – IETF ROAD Group IETF Group set up to examine the consumption of address space and the exponential growth in inter-domain routing entries and propose scalable solutions September 1993 – RFC1519 Classless Inter-Domain Routing ROAD outcome Routing refinements intended to alleviate pressure on B space Short term alleviation of address consumption through improved potential for address utilization 精品文档 IETF adoption of IPv6 June 1992 – IAB decides to adopt OSI CLNS as the successor protocol to IPv4 July 1992 – IETF plenary decides otherwise 1992 – 1994 – IETF undertakes an evaluation of a collection of potential next gen IP protocols TUBA, SIP, PIP, SIPP, …. 1994 – IETF design team defines IPv6 protocol 精品文档 IPv6 is… IP with: Larger address fields (128 bits) Yes, that’s a VERY big number! Smaller number of header fields Altered support for header extensions Addition of a flow label header field 精品文档 IPv6 What has not changed Almost everything! IPv6 is a connectionless datagram delivery service using end-to-end address identifiers and end-to-end signalling with TCP and UDP transport services. So is IPv4. 精品文档 IETF IPv6 Specifications There are 90 RFCs that describe aspects of IPv6 Including: RFC2460 Internet Protocol, Version 6 (IPv6) Specification [December 1998] RFC2373 IP Version 6 Addressing Architecture [July 1998] RFC3177 IAB/IESG Recommendations on IPv6 Address [September 2001] 精品文档 IETF IPv6 Working Group Request For Comments: An Architecture for IPv6 Unicast Address Allocation (RFC 1887) Internet Prot
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