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TCP/IP Guide by Charles M. Kozierok

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Mobile IP Addressing: Home and Care-Of Addresses

Just as most of us have only a single address used for mail, most IP devices have only a single address. Our traveling consultant, however, needs to have two addresses; a normal one and one that is used while he is away. Continuing the earlier analogy, the Mobile IP–equipped notebook the consultant carries needs to have two addresses:

Home Address The normal, permanent IP address assigned to the mobile node. This is the address used by the device on its home network, and the one to which datagrams intended for the mobile node are always sent.

Care-Of Address A secondary, temporary address used by a mobile node while it is traveling away from its home network. It is a normal 32-bit IP address in most ...

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