HA
Home Agent

The Home Agent is the function within the MIP (Mobile IP) architecture responsible for routing data to mobile nodes currently attached to a foreign network. This is achieved through a tunnelling process in which a CoA (Care-of-Address) is used to deliver the data to the mobile node. This CoA may be associated with a FA (Foreign Agent), in which case it is termed a FA CoA; or, it may be a co-located CoA meaning the mobile node is allocated an IP address in the foreign network.

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