Convergence of IPv6 Networks Through IPv4 Network Using Dual stack And Tunneling Mechanism

Abstract : Internet is a worldwide publicly accessible system of interconnected computer networks. Currently, two versions of the Internet Protocol (IP) are in use on the Internet namely IPv4 and IPv6. In some sense, there is a competition going on between these protocols, as they are not directly compatible, the aim of this project is to show the compatibility of Ipv6 packets through IPv4 and network providers and users are being forced to determine whether to support one or both protocols for various network services.

 EXISTING SYSTEM :

 Internet Protocol version 4 (IPv4) is the fourth revision in the development of the Internet Protocol (IP).IPv4 is a connectionless protocol for use on switched link networks (e.g., Ethernet).IPv4 is still by far the most widely deployed Internet layer protocol. It operates on a best effort delivery mode. IPv4 is a network that enables data sharing between two or more computers.

 DISADVANTAGE :

 • More latency: Fragmentation occurs at each of the routers, this leads to delay in the network. • Less security: There is no inbuilt security in the protocol. • Less address space: It has only 32 bits addresses, so the address space supports only 232 bits. • No auto configuration facility. • NAT(network address translation): It is used for the efficient utilization of IPv4 address. When there is a translation, decapsulation occurs which in turn security problem results.

 PROPOSED SYSTEM :

 Internet Protocol version 6 or IPv6.IPv6 (also known as IPng, IP next generation).IPv6 was developed by the Internet Engineering Task Force (IETF) to deal with this long-anticipated IPv4 address exhaustion.IPv6 is an Internet Layer protocol for packet-switched internetworking and provides end-to-end datagram transmission across multiple IP networks. IPv6 also implements additional features not present in IPv4.

 ADVANTAGE :

 • Larger Address Space: Address field in IPv6 is 128 bits long while the address field of IPv4 is only 32 bits in length. • Better header format: The header of IPv6 has been designed in a way to speed-up the routing process. • Security Features: To ensure IPsec confidentiality and packet's encryption and authentication options are included in IPv6. • Multicasting: Multicasting, the transmission of a packet to multiple destinations in a single send operation, is part of the base specification in IPv6.