IP version 4 has played a main role in the interworking environments for many years. It has proved flexible enough to work on many different networking technologies. However it has become a victim of its own success – explosive growth! - In the 1990s the “World Wide Web “and personal computers shifted the user of the Internet to the general public. This change has created heavy demands for new IP addresses; the lake of IPv4 addressing space was the basic problem. In the early 1990s IETF began to work on the IPv4 for solving the address exhaustion and other scalability problem. After several proposals were investigated a new IP version was recommended in late 1994, the new version is called IPv6 (also called IPng: IP next generation). IPv6 uses a 128 bit IP address made up at eight 16 bit integers separated by colons; IPv6 contains many new features including native security.
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