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Mobile IP encapsulation mechanism is used for mobile nodes and communication nodes to communicate. Communication of Mobile nodes and communication nodes have two possible ways. The first method is a two-way tunnel mode. Another way is to use route optimization. Two-way tunnel mode is not require the another communication end to support mobile IP. When the mobile node not to register to the other communicate side, which is in communication side not has the mobile node's binding information, they can communicate in this way. Communication sent to the mobile node to the end of the data reported by transmitted to home agent, and then transferred through the tunnel by the home agent to mobile node. Mobile node sent to communications data reported on the side of the first through the tunnel (known as reverse tunneling) to the home agent, then forwarded to the communication from the home agent on the side. Where the tunnel is achieved through the encapsulation mechanism.