Radius Server

Radius Server

Remote Authentication Dial In User Service (RADIUS) is a networking protocol that provides centralized Authentication, Authorization, and Accounting (AAA) management for computers to connect and use a network service. RADIUS was developed by Livingston Enterprises, Inc., in 1991 as an access server authentication and accounting protocol and later brought into the Internet Engineering Task Force (IETF) standards.

Because of the broad support and the ubiquitous nature of the RADIUS protocol, it is often used by ISPs and enterprises to manage access to the Internet or internal networks, wireless networks, and integrated e-mail services. These networks may incorporate modems, DSL, access points, VPNs, network ports, web servers, etc.

RADIUS is a client/server protocol that runs in the application layer, using UDP as transport. The Remote Access Server, the Virtual Private Network server, the Network switch with port-based authentication, and the Network Access Server (NAS), are all gateways that control access to the network, and all have a RADIUS client component that communicates with the RADIUS server. The RADIUS server is usually a background process running on a UNIX or Microsoft Windows server. RADIUS serves three functions:

  1. to authenticate users or devices before granting them access to a network,
  2. to authorize those users or devices for certain network services and
  3. to account for usage of those services.

Read more about Radius Server:  AAA, Roaming, Packet Structure, Vendor-specific Attributes, UDP Port Numbers, Security, RADIUS History, RFCs

Other articles related to "radius, radius server, server":

... FreeRADIUS is a modular, high performance free RADIUS suite developed and distributed under the GNU General Public License, version 2, and is free for download and use ... The FreeRADIUS Suite includes a RADIUS server, a BSD-licensed RADIUS client library, a PAM library, an Apache module, and numerous additional RADIUS related utilities and development libraries ... In most cases, the word "FreeRADIUS" refers to the free open source RADIUS server from this suite ...
Radius Server - RFCs
... The RADIUS protocol is currently defined in the following IETF RFCs Obsolete RFCs are indicated with strikethrough text ... Authentication Dial In User Service (RADIUS) January 1997 RADIUS Obsoleted by RFC 2138 RFC 2059 RADIUS Accounting January 1997 RADIUS Obsoleted by RFC 2139 RFC 2138 Remote Authentication Dial In User Service (RADI ... This protocol is also used to carry configuration information from the RADIUS server to the NAS ...
RADIUS - AAA - Accounting
... to the user by the NAS, an Accounting Start (a RADIUS Accounting Request packet containing an Acct-Status-Type attribute with the value "start") is sent by ... Periodically, Interim Update records (a RADIUS Accounting Request packet containing an Acct-Status-Type attribute with the value "interim-update ... the user's network access is closed, the NAS issues a final Accounting Stop record (a RADIUS Accounting Request packet containing an Acct-Status-Type attribute with the value "stop") to the RADIUS server, providing ...
Origination - Flow of Call
... The gatekeeper asks the Radius server to see if the username and password are correct and valid ... The Radius server queries the database and sends a yes/no reply to the gatekeeper ... goes to the gatekeeper, gatekeeper again asks the Radius server if the user is allowed to make this call and has enough money to initiate it ...
RADIUS - AAA - Authentication and Authorization
... or machine sends a request to a Remote Access Server (RAS) to gain access to a particular network resource using access credentials ... In turn, the RAS sends a RADIUS Access Request message to the RADIUS server, requesting authorization to grant access via the RADIUS protocol ... The RADIUS server checks that the information is correct using authentication schemes such as PAP, CHAP or EAP ...