By Jonathan Hassell

RADIUS, or distant Authentication Dial-In person provider, is a commonly deployed protocol that allows businesses to authenticate, authorize and account for distant clients who wish entry to a process or provider from a imperative community server. initially built for dial-up distant entry, RADIUS is now utilized by digital deepest community (VPN) servers, instant entry issues, authenticating Ethernet switches, electronic Subscriber Line (DSL) entry, and different community entry varieties. Extensible, effortless to enforce, supported, and actively constructed, RADIUS is at present the de facto commonplace for distant authentication. RADIUS presents an entire, distinctive consultant to the underpinnings of the RADIUS protocol, with specific emphasis at the application of consumer accounting. writer Jonathan Hassell attracts from his large event in net merchant operations to carry functional feedback and suggestion for imposing RADIUS. He additionally presents directions for utilizing an open-source edition known as FreeRADIUS.

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This is a unique property of attributes—they can stand alone, while values simply cannot. Attributes are transmitted inside the RADIUS packet in a predetermined, standard format, as shown in Figure 2-6. Figure 2-6. 6 Authentication Methods RADIUS supports a variety of different protocol mechanisms to transmit sensitive user-specific data to and from the authentication server. The two most common are the Password Authentication Protocol (PAP) and the CHAP. RADIUS also allows for more attributes and methods developed by vendors, including support for features peculiar to Windows NT, Windows 2000, and other popular network operating systems and directory services.

Note that when RADIUS client gear crashes, stop records in general are not sent to the accounting server. Obviously, this has the potential to mess up accounting data, and a crashed client is not all that uncommon. The payload value of the attribute contains 15 possible values, each of which are listed in Table 4-1. Table 4-1. Values for the Acct-Status-Type attribute Value Status type 1 Start This document is created with the unregistered version of CHM2PDF Pilot [ Team LiB ] This document is created with the unregistered version of CHM2PDF Pilot [ Team LiB ] Chapter 5.

Which user logged on? When did she do so? What services was he granted? The data becomes even more useful when it is compiled to analyze a group of users. What is the average call time for a user? How much data does that user transfer? Do I, as a system administrator, need to set a time limit for a single session so as to protect limited dial-in resources? Do I have users that are abusing an on-demand connection? All of these questions can be answered using information mined from the accounting process.

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