Recent years saw huge increase in Internet growth there were 40,073 networks on Internet (as of 10/4/94) and it was doubling approximately every 12 months. The current version (IPv4) of Internet Protocol was sufficient for 20 years, but if Internet will continue to grow, pretty soon we will run out of addresses for all connections because IPv4 can handle only 32 bit addresses (which are millions of connections). This is the major drawback of IPv4. The other issues is that IPv4 was not designed to handle real time applications such as video and audio efficiently and IPv4 can create a lot of fragmentation due to the lack of ability to predict or detect the bottlenecks in the packet’s path. The next generation of IP was designed by Internet Engineering Task Force (IETF) to handle all of these problems and was first presented on July 25, 1994 in Toronto. Thou structurally it is very different from IPv4; it still incorporates all the successful features of IPv4 like its ability to adapt to many topologies or technologies at the same time. IPv6 is increasing address format from 32 bits to 128 bits. This increase gave 340,282,366,920,938,463,463,374,607,431,768,211,456 addresses (should be more that the packet since switching the paths for each packet will degrade performance of the network. You (well the protocol) can request the unbreakable path, for the applications successfully transmit high quality video and audio over the net. Another great advantage of IPv6 is its compatibility with the IPv4. This will make transition between these two versions painless. Because it doesn't matter how well a new protocol is if there is nopractical way to transition the current operational systems running IPv4 to the new protocol. Structurally both versions are also different. They have different datagram systems and unlike IPv4, IPv6 does not specify all the possible protocol features, this makes it more adaptable to the user’s needs. The ...
