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Introduction Introduction A History of IPv6 and Its Key Features In 1992, the IETF (http://www.ietf.org/) became aware of a global shortage of IPv4 addresses and technical obstacles in deploying new protocols due to limitations imposed by IPv4. An IPng (IP next generation) effort was started to solve these issues. The discussion is outlined in several RFCs, starting with RFC 1550. After a large amount of discussion, in 1995, IPv6 (IP version 6) was picked as the final IPng proposal. The IPv6 base specification is specified in RFC 1883 and revised in RFC 2460. In a single sentence, IPv6 is a reengineering effort against IP technology. Key features are as follows. 1.1.1 Larger IP Address Space IPv4 uses only 2^32 bits for IP address space, which allows only (theoretically) 4 billion nodes to be identified on the Internet. Four billion may look like a large number; however, it is less than the world s population. Moreover, due to the allocation (in)efficiency, it is not possible to use up all 4 billion addresses. IPv6 allows 2^128 bits for IP address space, (theoretically) allowing 340,282,366,920,938,463,463,374,607,431,768,211,456 (340 undecillion) nodes to be uniquely identified on the Internet. Larger address space allows true end-to-end communication, without NAT or other short-term workarounds against IPv4 address shortage. (In these days, NAT has been a headache to new protocol deployment and scalability issues, and we really need to decommission NATs for the Internet to grow further.)
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