Performance Evaluation and Comparisons for Real Time Applications (VoIP) according to IPv6 and IPv4 Migration Techniques

Today IPv6 over IPv4 tunnels are widely used to connect large regional IPv6 networks, because it is relatively hard to construct an international or cross continent native IPv6 network. This makes the characteristics of IPv6 over IPv4 tunnels very vital to the performance of the global IPv6 Internet. In this paper we use the OPNET modeler 17.5 academic editions to evaluate the Tunneling between IPv4 and IPv6 routing protocol and dual stack technique. We create two scenarios in one topology the difference is based on the address type profile. In the first scenario all the clients has the same version of IP6 put the backbone network has ipv4 (tunneling). in the other scenario we used different ipv4 and ipv6 for each pair of clients and each pair uses different protocol (dual stack),. The result shows that the two protocols can coexist without any problems. The migration from IPv4 to IPv6 tunneling technique must be implemented node by node by using auto-configuration procedures to eliminate the need to configure IPv6 hosts manually.