AAA and Network Security for Mobile Access: Radius, Diameter, EAP, PKI and IP Mobility

8.3. AAA Extensions for Interaction with Mobile IP

As mentioned previously, the AAA infrastructure and the AAA protocol also need to support the interaction with the Mobile IP agents:

• Since the Mobile IP agents use AAA protocol to interact with AAA servers, they will be considered as AAA entities. The AAA functionality for Mobile IP agents needs to be defined clearly.

• The AAA protocol needs to specify the attributes and their semantics for carrying Mobile IP-related information between the AAA entities. The AAA protocol also needs to specify in what AAA messages these attributes must be carried.

• Functionality required for support of the Mobile IP authentication and key generation extensions at the AAA servers must be defined.

Of the two most prominent AAA protocols, only Diameter provides detailed specification for support of Mobile IP. At the time of writing no IETF standards for RADIUS interaction with Mobile IP exist, even though various communities have designed their own specifications for this interaction, as explained at the end of this chapter the authors have attempted to start an IETF standardization very recently [RADIUS MIPDR].

8.3.1. Diameter Mobile IPv4 Application

Diameter considers Mobile IPv4 as an application of its services and provides detailed specification for support of Mobile IP-AAA signaling [DIAMIP].

• Diameter Mobile IP application defines new commands and command codes for interaction between Mobile IPv4 agents and the AAA server and defines these interactions ...