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CHAPTER
9-1
Cisco 819 Series Integrated Services Routers Software Configuration Guide
OL-23590-02
9
Configuring Security Features
This chapter provides an overview of authentication, authorization, and accounting (AAA), which is the
primary Cisco framework for implementing selected security features that can be configured on the
Cisco
819 Integrated Services Routers (ISRs).
This chapter contains the following sections:
• Authentication, Authorization, and Accounting, page 9-1
• Configuring AutoSecure, page 9-2
• Configuring Access Lists, page 9-2
• Configuring Cisco IOS Firewall, page 9-3
• Configuring Cisco IOS IPS, page 9-4
• URL Filtering, page 9-4
• Configuring VPN, page 9-4
Authentication, Authorization, and Accounting
AAA network security services provide the primary framework through which you set up access control
on your router. Authentication provides the method of identifying users, including login and password
dialog, challenge and response, messaging support, and, depending on the security protocol you choose,
encryption. Authorization provides the method for remote access control, including one-time
authorization or authorization for each service, per-user account list and profile, user group support, and
support of IP, Internetwork Packet Exchange (IPX), AppleTalk Remote Access (ARA), and Telnet.
Accounting provides the method for collecting and sending security server information used for billing,
auditing, and reporting, such as user identities, start and stop times, executed commands (such as PPP),
number of packets, and number of bytes.
AAA uses protocols such as RADIUS, TACACS+, or Kerberos to administer its security functions. If
your router is acting as a network access server, AAA is the means through which you establish
communication between your network access server and your RADIUS, TACACS+, or Kerberos security
server.