The goal is to allow specification of RADIUS attributes to assist the Mobile IPv4 signaling procedures

If a foreign agent receives an un-encapsulated packet from a mobile node which had explicitly requested the Encapsulated Delivery Style, then the foreign agent MUST NOT

Whenever the Agent Advertisement contains the Challenge extension, if the mobile node does not have a security association with the Foreign Agent, then it MUST include

A foreign agent that receives a Registration Request with the ’T’ bit set processes the packet as specified in the Mobile IP specification [1], and determines whether it

In the case where a home agent is revoking a mobile node’s binding, and revocation support has been negotiated, the home agent MUST notify the foreign domain address it

In order for the home agent to be able to tunnel a Home Test message to the mobile node, it uses the current care-of address as the destination of the tunnel packets, as if

If a MN-HA Key Generation Nonce Request From AAA extension is present in the Registration Request message, then the mobile node MUST create or update its Mobility

When the DHCP server receives a message from a relay agent containing a RADIUS Attributes suboption, it extracts the contents of the suboption and uses that information

To do this a mobile node sends Binding Updates (BUs) to its Home Agent (HA) and all Correspondent Nodes (CNs) it communicates with, every time it moves.. Authenticating