When a mobile node moves between two foreign networks, it has to be
re-authenticated. If the home network has both multiple Authentication
Authorization and Accounting (AAA) servers and Home Agents (HAs) in
use, the Home AAA server may not have sufficient information to
process the re-authentication correctly (i.e., to ensure that the same
HA continues to be used). This document defines a Mobile IP extension
that carries identities for the Home AAA and HA servers in the form of
Network Access Identifiers (NAIs). The extension allows a Home Agent
to pass its identity (and that of the Home AAA server) to the mobile
node, which can then pass it on to the local AAA server when changing
its point of attachment. This extension may also be used in other
situations requiring communication of a NAI between Mobile IP nodes.
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