Using features such as NAT, has made the Internet discontiguous i.e. There is a requirement of protocol which can satisfy the need of future Internet addresses which are expected to grow in an unexpected manner. Internet has grown exponentially and the address space allowed by IPv4 is saturating. Given below are major points which played key role in birth of IPv6: This address space was considered more than enough that time. IPv4 is 32 bits long which offers around 4,294,967,296 (2 32) addresses. At the time of its birth, Internet was limited only to a few Universities for their research and to Department of Defense. It was designed in early 80’s and did not get any major change afterward. So far, IPv4 has proven itself as a robust routable addressing protocol and has served human being for decades on its best-effort-delivery mechanism. Along with its offering of enormous amount of logical address space, this protocol has ample of features which addresses today’s shortcoming of IPv4. This protocol as its predecessor IPv4, works on Network Layer (Layer-3). Internet Protocol version 6, is a new addressing protocol designed to incorporate whole sort of requirement of future internet known to us as Internet version 2.
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