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Each year 1.5 million shelter animals are euthanized (670,000 dogs and 860,000 cats). Source: ASPCA. The solution is not to shelter unwanted pets, but to SHUT DOWN THE PET MILLS. Anyone who wants a pet will just have to adapt a great pet from a shelter.

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RADIUS Protocol

RADIUS (Remote Authentication Dial-In User Service) is an application layer protocol that provides centralized Authorization, Authentication, and Accounting management for users who connect and use a network service. These networks may incorporate modems, access points, DSL, VPNs, etc.

Radius server is usually a background process running on a UNIX or Microsoft Windows server. The NAS (Network Access Server) forwards remote access requests to a RADIUS server via the RADIUS protocol. A request includes access credentials (username and password).

Communication between a NAS and a RADIUS server are based on UDP (User Datagram Protocol) a connectionless service. RADIUS protocols include CHAP, PEAP, PAP, EAP, or SIP Digest.

RADIUS server

When the RADIUS server receives the Access-Request from the NAS, it searches a database for the username and password provided. The RADIUS server does not contain a database, it is a protocol that defines how to work with a central database that maintains user profiles that all remote access servers share to provide authentication and authorization services.

RADIUS server can communicates with a domain controller for user authentication. If the username does not exist in the database or domain controller, either a default profile is provided or the RADIUS server sends an Access-Reject message which may be accompanied by a message indicating the reason for the refusal. After successful user authentication, remote access policies defined on the RADIUS server are applied to the connection.

The accounting features of the RADIUS protocol can be used independently of RADIUS authentication or authorization. The RADIUS accounting functions track when a session starts and stops, the amount of resources (such as time and data) used during the session.

More Networking Protocols and Standards:
• Video - The Upper Layers 5 Through 7 of the OSI Networking Model
• OSI Network Model
• Routing Datagrams
• Video - Network Layer (Layer 3) of OSI Networking Model
• A Simple Description of the IPv6 Header and Datagram
• Networking and Internet Standards Organizations
• Internet Protocol versions IPv4, IPv5 and IPv6
• What is PPP, PPPoA and PPPoE?
• TCP/IP Utilities
• Shortest Path Bridging (SPB) Protocol

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