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System Administration Guide: IP Services
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Mobile IP Functional Entities

Mobile IP introduces the following new functional entities:

  • Mobile node (MN) – Host or router that changes its point of attachment from one network to another network while maintaining all existing communications by using its IP home address.

  • Home agent (HA) – Router or server on the home network of a mobile node. The router intercepts datagrams that are destined for the mobile node. The router then delivers the datagrams through the care-of address. The home agent also maintains current information on the location of the mobile node.

  • Foreign agent (FA) – Router or server on the foreign network that the mobile node visits. Provides host routing services to the mobile node. The foreign agent might also provide a care-of address to the mobile node while the mobile node is registered.

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