IPv4/IPv6 Transition Mechanisms

Currently, the Internet consists of native IPv4 (IPv4-only), native IPv6, and IPv4/IPv6 dual networks. Unfortunately, IPv4 and IPv6 are incompatible protocols. When both IP versions are available and the users of Internet want to connect without any restrictions, a transition mechanism is required. During the time of migration from IPv4 to IPv6 networks, a number of transition mechanisms have been proposed by IETF to ensure smooth, stepwise and independent changeover. IPv4/IPv6 transition always occurs process in deploying IPv6-based services across the IPv4 Internet. The IETF Next Generation transition working group (NGtrans) has proposed many transitions Mechanisms to enable the seamless integration of IPv6 facilities into current Networks