TAILIEUCHUNG - Chapter 6 - AAA on the Internet

The term AAA has been traditionally used to refer to Authentication, Authorization, and Accounting activities. All of those activities are of crucial importance for the operation of an IP network, although typically they are not so visible to the end user. The importance of AAA functions lies in the fact that they provide the required protection and control in accessing a network. As a consequence, the administrator of the network can bill the end user for services used. | Chapter 6 AAA on the Internet Authentication Authorization and Accounting The term AAA has been traditionally used to refer to Authentication Authorization and Accounting activities. All of those activities are of crucial importance for the operation of an IP network although typically they are not so visible to the end user. The importance of AAA functions lies in the fact that they provide the required protection and control in accessing a network. As a consequence the administrator of the network can bill the end user for services used. By services we are referring to any type of services related to the access of the network such as high bandwidth provision of routing services gateway services etc. Before we proceed with this chapter let us agree on a common terminology. Authentication. This is the act of verifying the identity of an entity subject . Authorization. This is the act of determining whether a requesting entity subject will be allowed access to a resource object . network access certain amount of bandwidth etc. . Accounting. This is the act of collecting information on resource usage for the purposes of capacity planning auditing billing or cost allocation. All of these concepts are intimately linked. For instance it is not feasible to record the usage of a resource when the entity subject making usage of the resource object is not yet known. Therefore in order to account for the usage of a resource the entity has to be authenticated. Once the subject is authenticated it can be authorized to access the resource. Here we are speaking generically. A resource could be access to a network a radio resource or access to a conference bridge. The rest of this chapter describes the Internet architecture needed to provide the network functions of AAA. We will learn about the protocols that the IETF has developed to provide the mentioned functions. AAA Framework on the Internet At the beginning of 1997 the IETF defined the Remote Authentication Dial

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