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by Thomas Akin
Hardening Cisco Routers
Preface
Organization
Audience
Conventions Used in This Book
How to Contact Us
Acknowledgments
1. Router Security
1.1. Router Security?
1.2. Routers: The Foundation of the Internet
1.3. What Can Go Wrong
1.3.1. Consequences of Compromised Routers
1.4. What Routers Are at Risk?
1.5. Moving Forward
2. IOS Version Security
2.1. The Need for a Current IOS
2.2. Determining the IOS Version
2.3. IOS Versions and Vulnerabilities
2.3.1. IOS Versions
2.3.2. IOS Naming Scheme
2.3.3. Vulnerabilities
2.4. IOS Security Checklist
3. Basic Access Control
3.1. Authentication Versus Authorization
3.2. Points of Access
3.3. Basic Access Control
3.3.1. Authentication and Authorization
3.3.1.1. Console password
3.3.1.2. AUX and VTY passwords
3.3.1.3. Privileged-level access control
3.3.1.4. Local username access control
3.3.1.5. TACACS access control
3.3.1.6. Disabling console, auxiliary, and VTY logins
3.3.2. TFTP Access
3.4. Remote Administration
3.4.1. Danger of Remote Administration
3.4.2. Dial-up Access
3.4.2.1. Reverse Telnet
3.4.3. VTY Access
3.4.3.1. Disabling VTY access
3.4.3.2. SSH
3.4.3.3. Limiting VTY access by IP
3.4.3.4. Additional VTY settings
3.4.4. HTTP/Web Access
3.4.4.1. Limiting HTTP access by IP
3.4.4.2. HTTP authentication
3.5. Protection with IPSec
3.5.1. Setting up ISAKMP
3.5.2. Creating the IPSec Extended ACL
3.5.3. Creating IPSec Transforms
3.5.4. Creating the Crypto Map
3.5.5. Applying the Crypto Map to an Interface
3.6. Basic Access Control Security Checklist
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Hardening Cisco Routers
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