RADIUS - Overview


RADIUS is a protocol for carrying information related to authentication, authorization, and configuration between a Network Access Server that desires to authenticate its links and a shared Authentication Server.

  • RADIUS stands for Remote Authentication Dial In User Service.

  • RADIUS is an AAA protocol for applications such as Network Access or IP Mobility

  • It works in both situations, Local and Mobile.

  • It uses Password Authentication Protocol (PAP), Challenge Handshake Authentication Protocol (CHAP), or Extensible Authentication Protocol (EAP) protocols to authenticate users.

  • It look in text file, LDAP Servers, Database for authentication.

  • After authentication services parameters passed back to NAS.

  • It notifies when a session starts and stop. This data is used for Billing or Statistics purposes.

  • SNMP is used for remote monitoring.

  • It can be used as a proxy.

Here is a Simple Network Diagram of Radius:

Radius Network Diagram

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