Date Added: Jul 2012
Mobile IP works like an abstractor between the Transport layer and network layer. It allows mobile devices to maintain ongoing connection irrespective of their change of networks. Mobile Internet Protocol (MIP) is defined by Internet Engineering Task Force (IETF). This standard protocol states that whenever any Mobile Node (MN) changes its location it has to register its new address, i.e., Care-of-Address (CoA) with Home Agent (HA). Triangular routing is done in MIPv4 as MN directly sends messages to CN but CN sends messages to MN via HA. MPIv6 removed this triangular problem by allowing exchange of messages directly to each other only after performing return routability procedure to setup secure and authenticated communication.