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TCP/IP Guide by Charles M. Kozierok

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Mobile IP Home Agent Registration and Registration Messages

Once a mobile node has completed Agent Discovery, it knows whether it is on its home network or a foreign network. If it's on its home network, it communicates as a regular IP device, but if it's on a foreign network, it must activate Mobile IP. This requires that it communicate with its home agent so that information and instructions can be exchanged between the two. This process is called home agent registration, or more simply, just registration.

The main purpose of registration is to actually start Mobile IP working. The mobile node must contact the home agent and tell it that it is on a foreign network and request that datagram forwarding be turned on. It also must let the home agent ...

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