very difficult problems of mobility

Wong takes us through what might be a crucial next buildout of the Internet. To permit future and better wireless usage. So the book gives a background explanation of the current Internet, version 4. Then, it goes into explaining Mobile IP, which is an enhancement that tackles the difficult problems inherent in having an Internet node wandering like a cellphone. You can get an appreciation of the scale of the puzzle. Where a user might take her device from one wireless Internet cell to another, and expect to transparently access the Internet, without any manual system changes. A vast step in complexity beyond DHCP.

Wong also maps out IPv6, for a future when the current IPv4 address space gets exhausted. He also suggests ways that v6 can implement quality of service and mobility.

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