Mobile IPv4 White Paper

Fig 1-2. Mobile Node Authentication
1. Mobile Node sends a registration request message to the
Foreign Agent.
2. The Foreign Agent sends a Diameter AA-Mobile Node
Request (AMR) message to the local AAA Server (AAAF)
that includes the Mobile IP registration request in it.
3. The AAAF forwards the AMR message to the AAA Server
(AAAH) in the home network.
4. The AAAH builds a Diameter Home Agent MIP Request
(HAR) message from the information in the AMR and
forwards it to the Home Agent. The HAR includes the
Mobile IP registration request.
5. The Home Agent processes the HAR message and sends a
Diameter Home Agent MIP Answer (HAA) message to the
AAAH. The HAA includes the Mobile IP registration reply.
6. The AAAH processes the HAA and builds a Diameter AA-
Mobile Node Answer (AMA) message from the
information in the HAA and sends it to the Foreign Agent.
The AMA includes the Mobile IP Registration Reply.
7. The Foreign Agent processes the Registration Reply and
then sends it to the Mobile Node.
9 HP-UX Mobile IPv4 White Paper