For example, they will be used to facilitate connectivity for the service known as roaming. Roaming service will offer traveling end users fast, convenient, and inexpensive local access to the Internet from anywhere in the world. In addition to the dial VPN for corporate networks, other candidates for roaming service include regional or national ISPs looking to form consortiums to provide broader coverage to a constituency in different geographic areas. I-Pass is another that offers its ISP members a roaming authentication and clearinghouse service. In both cases, a distributed AAA approach enables the home ISP to maintain access control while providing enhanced connectivity services.
Roaming customers can access the network through visited ISPs.
Dial providers must now provide AAA services for hundreds and thousands of concurrent end users accessing network services over a variety of technologies. They must also support AAA services across ISP boundaries in a secure and scalable manner. This is beginning to place a burden on the functional capabilities of the existing AAA protocols. Therefore, the IETF has undertaken an effort to develop a next-generation AAA protocol. A New Foundation.