This document is only a guide to recommended security settings for Internet Protocol (IP) routers, particularly routers running Cisco Systems Internet Operating System (IOS) versions 11 and 12. It is not meant to replace well-designed policy or sound judgment. This guide does not address site-specific configuration issues. Care must be taken when implementing the security steps specified in this guide. Ensure that all security steps and procedures chosen from this guide are thoroughly tested and reviewed prior to imposing them on an operational network.
Contents:
1. Introduction : 1.1. The Roles of Routers in Modern Networks, 1.2. Motivations for Providing Router Security Guidance
1.3. Typographic and Diagrammatic Conventions Used in this Guide, 1.4. Structural Overview.
2. Background and Review: 2.1. Review of TCP/IP Networking. 2.2. TCP/IP and the OSI Model 2.3. Review of IP Routing and IP Architectures 2.4. Basic Router Functional Architecture 2.5. Review of Router-Relevant Protocols and Layers 2.6. Quick “Review” of Attacks on Routers 2.7. References.
3. Router Security Principles and Goals: 3.1. Protecting the Router Itself 3.2. Protecting the Network with the Router 3.3. Managing the Router 3.4. Security Policy for Routers 3.5. References.
4. Implementing Security on Cisco Routers
4.1. Router Access Security 4.2. Router Network Service Security 4.3. Access Lists and Filtering 4.4. Routing and Routing Protocols 4.5. Audit and Management 4.6. Security for Router Network Access Services 4.7. Collected References
5. Advanced Security Services 163
5.1. Role of the Router in Inter-Network Security 5.2. IP Network Security 5.3. Using a Cisco Router as a Firewall 5.4. Using SSH for Remote Administration Security 5.5. References.
6. Testing and Security Validation 203
6.1. Principles for Router Security Testing 6.2. Testing Tools 6.3. Testing and Security Analysis Techniques Reference
7. Future Issues in Router Security 213
7.1. Routing and Switching 7.2. ATM and IP Routing 7.3. IPSec and Dynamic Virtual Private Networks 7.4. Tunneling Protocols and Virtual Network Applications 7.5. IP Quality of Service and RSVP 7.6. Secure DNS 7.7. References.
8. Appendices 223
8.1. Top Ways to Quickly Improve the Security of a Cisco Router 8.2. Application to Ethernet Switches and Related Non-Router Network Hardware 8.3. Overview of Cisco IOS Versions and Releases 8.4. Glossary of Router Security-related Terms.
9. Additional Resources 243
9.1. Bibliography 9.2. Web Site References 9.3. Tool References.
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