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Mobile IPv6
When an IP node moves from one network to another, as when a notebook
computer is used in more than one location, one way to accommodate the
changes in the network is to use two or more sets of network configuration
to match each location. However, another solution is to use a mobile IP pro-
tocol to allow the computer to use one IP address for all its communications
across any network to which it is attached.
Mobile IP, however, should not be confused with the mechanisms required
to allow fast handovers in cellular wireless networks. In that type of
network, the handovers are handled at the link layer rather than at the
network layer. ...