# Configuring RADIUS Relay Server

This chapter describes the E Series router’s RADIUS relay server feature. The RADIUS relay server provides authentication, authorization, accounting, and addressing services to wireless subscribers in public areas, such as airports and coffee shops. This chapter has the following sections:

- Understanding the RADIUS Relay Server
- RADIUS Relay Server Platform Considerations
- RADIUS Relay Server References
- RADIUS Relay Server and the SRC Software
- Configuring RADIUS Relay Server Support