Internet Protocol Version IPv6 is a newer version of Internet Protocol Version IPv4. In IPv6 significant changes has been created to overcome the Internet Protocol Version IPv4 limitations. In IPv4 limitations include the following :
Limited address space: IPv4 uses only 32-bits to represent addresses. IANA has allocated the majority of these addresses.
Difficult routing management: IANA has not provisioned allocated IPv4 addresses for efficient route management. As a result, Internet backbone routers have over 85,000 routes in their routing tables.
Complex host configuration: Automatic configuration of IPv4 hosts requires that you implement DHCP.
No built-in security: IPv4 does not include any method for securing network data. You must implement Internet Protocol Security (IPSec) and other protocols to secure data on IPv4 networks, but this requires significant configuration and can be complex to implement.
Limited Quality of Service (QoS): The implementation of QoS in IPv4 relies on the use of TCP and User Datagram Protocol (UDP) ports to identify data. This may not be appropriate in all circumstances.
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