Today internet and Internet basic technologies has become part of our day to day life. The Internet operates using group of rules called Internet protocol as it foundation. THE WEB Protocol can be used to interconnect packet-switched communication network to make-up internet. It transmit stop of data (datagram) received to and from source and vacation spot host.  The present version of Internet Protocol IPv4 that is use by different organisations worldwide and in the internet originated 30 years by the United States Office of Defence (DoD), and assessed severally to attain the vigorous IPv4 that people are experiencing today. 
IPv4, the present version of the web Protocol use worldwide, has been energetic and easy to deploy, It has additionally successful operate with group of protocols and applications and yet scalable to increasing users and devices on the internet today.
However, the growing solutions and increasing number of devices hooking up to internet couple with the confidential ecommerce transactional data transfer online has reveal the restrictions and the features of IPv4 at the internet present range.
IPv6 originated specifically to handle these limitations, allowing Internet growth and development in future.
1. 1 Constraints of IPv4
Address Space: IPv4 provides about 4. 3 billion IP addresses on the internet.  The world populace as today is approximately 6. 8 billion as record by USA Census Bureau . It really is generally expected that each home will have at least one computer that is connected to the Internet. Comparing the globe human population and address space provided the IPv4 obviously shows that the Internet Protocol has come of age range to be replace by it successor. The graph (Physique 1) below shows the speculation made on the address host to IPv4. The graph below shows the fast depletion of the address and speculated that the address will be exhausted in 2012.
Figure 1: The graph displaying use of IPv4 address space.
Security-As a result of huge traffic of private information, transactions, copy online, security is becoming one of the most valuable features a system should provide. IPv4 had not been built or designed at first with no feature of security. Online private network is usually use to
Overcoming the Limits of IPv4
Several techniques has been use to address the constraints of the IPV4 like NAT, DHCP, CIDR and VPN to solve the situation of security.
Address Space - The IPv4 skimpy address space was long expected, The release of NAT (Network Address Translation) " having one open public address and connecting large numbers of devices through the general public address to access internet, Dynamic Web host Configuration Protocol (DHCP) - dynamically sign up and assigning IP address to machine or device when linked to a network and Classless Inter Domain Routing (CIDR) techniques were all use to extend living of IPv4.
Security - The Virtual Private Network (VPNs) is the technique use in overcoming the security restriction of IPv4. That is implemented at the gateway machines of the two network that is about to communicate, the data are encrypted and tunnel with extra headers to vacation spot gateway, the gateway machine decrypts data and onward the packet to vacation spot machine. Deployment of the security offers a considerable level of security but it is not cost effective. This may in purchasing of extra equipment, and re settings of network in doing so increasing the complexity of network system.
Overcome the Limits of IPv4
Several techniques has been use to address the limits of the IPV4 like NAT, DHCP, CIDR and VPN to solve the condition of security.
Address Space - The IPv4 skimpy address space was long expected, The launch of NAT (Network Address Translation) " having one public address and joining huge number of devices through the general public address to gain access to internet, Dynamic Coordinator Configuration Protocol (DHCP) - dynamically subscription and assigning Ip to machine or device when linked to a network and Classless Inter Website Routing (CIDR) techniques were all use to extend the life span of IPv4.
Security - The Virtual Private Network (VPNs) is the approach use in conquering the security limitation of IPv4. That is put in place at the gateway machines of both network that is about to communicate, the data are encrypted and tunnel with extra headers to vacation spot gateway, the gateway machine decrypts data and forward the packet to destination machine. Deployment of this security provides a considerable degree of security but it isn't cost effective. This can in purchasing of extra equipment, and re configuration of network thus increasing the complexity of network system.
Technological Advantages of IPv6
Support Plug and Play
The plug and play or auto configuration is one of the exciting top features of IPv6. This feature permits huge number of devices to boot and dynamically uncover the network and acquire one or more valid network parameter had a need to connect to internet or to the network. In IPv4, these addresses are given personally or by the utilization DHCP. The use of DHCP server in IPv6 is optional. This feature of car construction is very internet allow services such cordless alternatives and mobile solutions.
Auto settings, as the name indicates is make renumbering of devices and machines on the network as the start-up and register these devices automatically. It helps you to save a whole lot of cost and time on IP network. Picture configuration of DHCP server every time new equipment or replacement unit in a cooperate company. 
Support for Mobile IP and Mobile Devices
IPv6 uses inbuilt of vehicle settings feature mobile device to pay attention and observe the Care- of -Address, eradicating the need for Home Agent and Foreign Agent. In Mobile IP network, devices to move from network location to another without breaking or lack of their existing connection. This binding strategy allows direct communication between the Mobile Node and the Corresponding Node. This get rid of the triangular routing use in traditional routing use IPv4and the triangular routing in IPv4. The structural design of Mobile IPv6 is very effective support roaming and timely communication because the Mobile Node communicate immediately with the Corresponding Node.
Support for Inbuilt IPSec
IPv6 offers Internet Protocol Security (IPSec) by default as compare to its forerunner IPv4 which is optional. It provides expansion headers for authentication, encryption and making VPN deployments easier. The automated attainment of valid network parameter IP address couple with inbuilt security protocol suite (IPSec) in IPv6, makes end-to-end security services simple with less effect on the network bandwidth unlike in IPv4 which involves encapsulation of extra header before tunnelling the datagram.
Network Prtocols, by Mattew Naugle, Publisher Mcgraw- hill Signature page 496
 http://en. wikipedia. org/wiki/IPv6
 http://netrex. com/documents/whitepapers/IPv6. pdf
http://en. wikipedia. org/wiki/World_population
http://www. ixiacom. com/library/white_papers/wp_display. php?skey=ipv6#A1
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