Cisco Systems 3.5 manual Types of Radius Messages, Packet Contents

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Chapter 1 Overview

RADIUS Protocol

Step 8 Cisco Access Registrar formats the response based on the Response dictionary and sends it back to the client (NAS).

Step 9 The NAS receives the response and communicates with the user, which may include sending the user an IP address to indicate the connection has been successfully established.

Types of RADIUS Messages

The client/server packet exchange consists primarily of the following types of RADIUS messages:

Access-Request—sent by the client (NAS) requesting access

Access-Reject—sent by the RADIUS server rejecting access

Access-Accept—sent by the RADIUS server allowing access

Access-Challenge—sent by the RADIUS server requesting more information in order to allow access. The NAS, after communicating with the user, responds with another Access-Request.

When you use RADIUS accounting, the client and server can also exchange the following two types of messages:

Accounting-Request—sent by the client (NAS) requesting accounting

Accounting-Response—sent by the RADIUS server acknowledging accounting

Packet Contents

The information in each RADIUS message is encapsulated in a UDP (User Datagram Protocol) data packet. A packet is a block of data in a standard format for transmission. It is accompanied by other information, such as the origin and destination of the data.

lists each message packet which contains the following five fields:

Table 1-1RADIUS Packet Fields

Fields

Description

 

 

Code

Indicates what type of message it is: Access-Request,

 

Access-Accept, Access-Reject, Access-Challenge,

 

Accounting-Request, or Accounting-Response.

 

 

Identifier

Contains a value that is copied into the server’s response so the

 

client can correctly associate its requests and the server’s responses

 

when multiple users are being authenticated simultaneously.

 

 

Length

Provides a simple error-checking device. The server silently drops

 

a packet if it is shorter than the value specified in the length field,

 

and ignores the octets beyond the value of the length field.

 

 

Cisco Access Registrar 3.5 Concepts and Reference Guide

 

OL-2683-02

1-3

 

 

 

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Contents Corporate Headquarters Cisco Access Registrar 3.5 Concepts and Reference GuideCisco Access Registrar 3.5 Concepts and Reference Guide Iii N T E N T SSession-Service Service Step and Radius-Session Service Replication’s Impact on Request Processing IPAddress Port Understanding Snmp Vii Accounting Start Data FlowViii World Wide Web Obtaining DocumentationCisco.com Obtaining Technical AssistanceOrdering Documentation Documentation FeedbackContacting TAC by Using the Cisco TAC Website Technical Assistance CenterContacting TAC by Telephone Xii Radius Protocol OverviewPacket Exchange Between User, NAS, and Radius Steps to ConnectionTypes of Radius Messages Packet ContentsAttribute Dictionary Proxy ServersProxying to an Ldap Server for Authentication Basic Authentication and AuthorizationOverview Basic Authentication and Authorization Cisco Access Registrar Hierarchy Understanding Cisco Access RegistrarScripts ServicesUserLists and Groups ProfilesSession Management Using Resource Managers Cisco AR Directory Structure Program FlowSubdirectory Description Action Explanation Scripting PointsClient or NAS Scripting Points Cisco AR Server Action ExplanationRadius/Advanced/RequireNASsBehindProxyBeInClie Authentication and/or Authorization Scripting PointsFailover by the NAS and Session Management Session ManagementAuthentication/Authorization Scripts Script Processing HierarchyIncoming Scripts Cross Server Session and Resource Management OverviewOutgoing Scripts Configuring a Front Line Cisco Access Registrar Session-Service Service Step and Radius-Session ServiceConfigure Central AR OL-2683-02 Using Cisco AR Scripts ACMEOutgoingScriptAltigaIncomingScript AscendIncomingScript AuthorizeServiceAltigaOutgoingScript ANAAAOutgoingCiscoIncoming AuthorizeTelnetCabletronIncoming CabletronOutgoingExecNASIPRule ExecTimeRuleExecDNISRule ExecFilterRuleParseAAASRealm LDAPOutageMapSourceIPAddress ParseAAARealmParseServiceAndAASRealmHints ParseServiceAndAAARealmHintsParseServiceAndAAASRealmHints ParseServiceAndAARealmHintsParseTranslationGroupsByRealm ParseServiceHintsParseTranslationGroupsByCLID ParseTranslationGroupsByDNISUSROutgoingScript Replication Overview Understanding ReplicationHow Replication Works Replication Data FlowMaster Server Slave Server SecurityReplication Archive Ensuring Data IntegrityTransaction Data Verification Transaction OrderAutomatic Resynchronization Replication’s Impact on Request Processing Replication Configuration SettingsUnderstanding Hot-Configuration Full ResynchronizationMaster RepTypeRepTransactionSyncInterval RepTransactionArchiveLimitRepIPMaster RepIPAddressRepPort RepSecretIPAddress Rep Members SubdirectoryRep Members/Slave1 NameSupported MIBs OverviewRADIUS-AUTH-SERVER-MIB Snmp TrapsCarInputQueueFull Supported TrapsCarServerStart CarServerStopCarOtherAuthServerNotResponding CarOtherAuthServerRespondingCarOtherAccServerNotResponding Directories Searched Configuring TrapsCarOtherAccServerResponding CarAccountingLoggingFailureSwitching Configuration Files in Mid-File Configuration File TypesCommunity String OL-2683-02 Prepaid Billing Solution Measurements and Component Actions Configuring Prepaid Billing Call Flow Details Generic Call FlowAttribute Number Attribute Name Description Access-Request AuthenticationAccess-Accept Authentication Access-Request AuthorizationAccess-Accept Authorization Accounting Start Data FlowAttribute Number Attribute Name Accept-Accept Quota Depleted Access-Request Quota DepletedAccounting Response Final Status Accounting Stop Session EndSource VSA Name Type Call Flow Description Vendor-Specific AttributesTotal Volume quota received by Crbprivate GL-1 O S S a R YGL-2 Scalable wholesale access/open access solutionGL-3 GL-4 GL-5 GL-6 GL-7 GL-8 GL-9 GL-10 IN-1 RadiusIN-2 RFCIN-3 IN-4
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3.5 specifications

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