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RADIUS (Remote Authentication Dial-In User Service)

RADIUS is a networking protocol providing centralized authentication, authorization, and accounting for network access.

What is RADIUS?

RADIUS is a client/server protocol and software that enables remote access servers to communicate with a central server to authenticate users and authorize access to network services.

RADIUS functions

Authentication, Authorization, Accounting (AAA).

Common misconceptions

  • "RADIUS is only for dial-up" — Used for WiFi, VPN, etc.
  • "RADIUS is outdated" — Still standard for network AAA
  • "RADIUS is secure by default" — Consider RADIUS over TLS