IPv4 addresses are not making up the demand of increasing clients. IPV4 addresses have contains 32 bit length; while in IPV6 addresses contains 128 bit. As we know that IPV4 addresses are in binary numbers and represented in decimal; while IPV6 addresses are binary and represented in hexadecimal number. Journey has to be completed from IPv4 to IPv6 because in addition to increase the number of IP addresses it’s efficiency, design, security and many other additional profits are also gained. IPv6 is going to overcome all the disadvantages of IPv4. Presently, IPv6 over IPv4 tunnels are widely used to form the global IPv6 Internet. As we already know that Internet Protocol (IPv6) has been developed to replace the Internet Protocol (IPv4).Transition from IPv4 to IPv6 is a obligatory process in the realization of global Internet. The development of IPv6 technology and continuous increases in application, but this process will take long time so a transition method will be needed. There are many IPv4/IPv6 transition methods already exist today, some of them applied in practice and other are still as proposed solutions. IPV4 has less secured than IPV6. It means that introduce IPV6 has high security inbuilt features as compare to IPV4. Tunnelling and encapsulation methods are the mainly techniques that used until now, but all encapsulation mechanisms suffer from the increasing of the overhead traffic network as a result for either encapsulating IPv4 packet in the IPv6 packet or encapsulating IPv6 packet in the IPv4 packet. In this paper we just analysis the IPV4 and IPV6 features, uses and its characteristics that how these protocols are used in networking.
IPv4, IPv6, Security comparison, IP threats, IP attacks.