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TCP/IP Guide by Charles M. Kozierok

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Mobile IP Data Encapsulation and Tunneling

Once a mobile node on a foreign network has completed a successful registration with its home agent, the Mobile IP datagram forwarding process described earlier in this chapter will be fully "activated." The home agent will intercept datagrams intended for the mobile node as they are routed to its home network, and forward them to the mobile node. Encapsulating the datagrams, and then sending them to the node's care-of address, does this.

Encapsulation is required because each datagram that you intercept and forward needs to be resent over the network to the device's care-of address. In theory, the designers might conceivably have done this by just having the home agent change the destination address and ...

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