Chapter 2. Security Protocols
- RADIUS is a client/server protocol that uses the User Datagram Protocol (UDP) as the transport protocol. It is used for authentication, authorization, and accounting (AAA).
- The RADIUS specification RFC 2865 obsoletes RFC 2138. The RADIUS accounting standard RFC 2866 obsoletes RFC 2139.
- The RADIUS protocol defines things in terms of attributes. Each attribute may take on one of a set of values. When a RADIUS packet is exchanged among clients and servers, one or more attributes and values are sent pairwise as an attribute-value pair (A-V pair).
Figure 2-1 depicts the RADIUS authentication process.
FIGURE 2-1 RADIUS authentication process
Step 1. Network Access Server Sends an Access Request to AAA server. ...