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Before RADIUS can be implemented into your network, you need to 1Configure a RADIUS security access server and populate it with valid user accounts 2Set up the network devices to use RADIUS Configuring RADIUS on the network devices has been described previously in this chapter Configuring the RADIUS server is covered in the section on CiscoSecure, since we are focusing on the CiscoSecure ACS in this chapter
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Terminal Access Controller Access Control System (TACACS+) simplifies access management by providing the means to manage network security authentication, authorization, and accounting (AAA) from a server The benefits of TACACS+ are Secure login to network devices Multiple levels of user privileges Centralized control over user accounts and privileges Redundancy for TACACS+ servers and user database Accounting records Unlike RADIUS, which uses UDP to exchange information between the network access server and the security server, TACACS+ uses TCP Since TCP is a connection- oriented transport protocol, it provides immediate indication of an unavailable server The relationship between TACACS+ and the NAS is almost identical to that of RADIUS and the NAS Here are the steps of the general process of logging into a network device, as illustrated in Figure 16-6:
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Figure 16-6: TACACS+ login process 1A user initiates a Telnet session with a router acting as a network access server 2The NAS prompts the user for a username and password (cleartext) 3The router encrypts the entire body of the packet and sends it to a TACACS+ server (RADIUS encrypts only the password) 4The TACACS+ server checks its database to validate the user If the user is valid, the TACACS+ server sends an OK to the router, as well as a privilege level for the user 5The router allows the user access and the Telnet session continues (cleartext)
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Before TACACS+ can be implemented on your network, you need to 1Configure a TACACS+ server and populate it with valid user accounts 2Set up the network devices to use TACACS+ Configuring TACACS+ on the network devices has been described previously in this chapter Configuring the TACACS+ server is covered in the section on CiscoSecure, since we are focusing on the CiscoSecure ACS in this chapter
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CiscoSecure Access Control Server (ACS) v21 is software installed on Windows NT to support the centralization of access control, and accounting for dial-up access servers and firewalls This software, when configured properly, controls the authentication, authorization, and accounting (AAA) of administrators accessing thousands of network ports CiscoSecure ACS assists you in controlling users' login to the network, the privileges or authorizations of the administrator, and the accounting information to be recorded on the administrator Key features and benefits include the following: Simultaneous TACACS+ and RADIUS support HTML/JAVA GUI providing an administrator-friendly interface that simplifies and distributes configuration for administrator profiles, group profiles, and ACS configuration Group assignments for administrators, to simplify changes in security policies Domain stripping and authentication forwarding Automatic replication
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CHAP, PAP, and ARA password support Time-of-day and day-of-week access restrictions Administrator capability to configure permitted failed attempts before account is disabled Administrator capability to view active sessions Windows NT performance-monitoring support for real-time statistic viewing CiscoSecure for NT can reference the NT user database for the AAA request; therefore, user accounts need not be maintained in both the AAA and NT In addition, CiscoSecure can access the Novell NDS database; this is actually done with a Microsoft utility that allows NT to access NDS Plans for the next version of Cisco Secure include the capability to access information on the Windows 2000 LDAP directory, as well Following the system requirements for CiscoSecure ACS v21 for Windows NT
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