What is RADIUS?

What is RADIUS?

What is RADIUS?

RADIUS stands for “Remote Authentication Dial-In User Service”. An application layer protocol that provides AAA (Authentication, Authorization, and Accounting) for users who uses network services.

It is a client/server model. Means, centralized networking with communicating systems are either client or server (each with equal responsibilities).

RADIUS uses TCP or UDP protocol for transport mechanism and uses the 1812-port number.

Authentication: It is a process of identifying correct user.
Authorization: It is the process of giving access to an user to the correct resource/web page.
Accounting: It is a process of tracking user activities.

How RADIUS works?


Step 1: User requests point-to-point protocol (PPP) authentication to the network access server (NAS).

PPP: It creates direct connection between two network nodes. It supports Password Authentication Protocol (PAP) and Challenge Handshake Authentication Protocol (CHAP).

NAS: It is a service that clients dial to get access to the network.

Step 2: NAS ask for credentials.

Step 3: User provides credentials.

Step 4: RADIUS client sends user-provided credentials to RADIUS server with a password in encrypted form.

Step 5: RADIUS server gives a response with the status like accepted or rejected. Then RADIUS client acts upon the parameters of the services.

Where RADIUS authentication used?

• Internet service provider (ISP) uses RADIUS authentication to provide security to the user.
• Educational organizations use the RADIUS authentication to secure their dial-in IP network.

What are the benefits of using UDP protocol in RADIUS authentication?

• No rebooting required
• UDP is a stateless protocol
• Easy to implement
• Time-saving

What are the advantages of using RADIUS authentication?

• Centralized networking
• Provides security against sniffing
• Easy to configure
• It supports multiple authentication methods

8 Replies to “What is RADIUS?”

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