NIDS hardening is usually very straightforward. NIDS generally don't support any ancillary services, so they are fairly easy to secure. The primary hardening task is to ensure that the detection interface is not reachable at L3 and that the management interface connects directly back to a trusted location within your management network. This way, the NIDS should be difficult to access from the location in which you are likely to see the most attacks.

The second main step includes the more traditional hardening functions for any system. Enable logging, set passwords, use SSH, disable unneeded services (if any), and configure NTP.

Configuration commands for the Cisco Intrusion Detection System (IDS; version 4.0 was tested for this book) are based on a simple menu system accessed by connecting to the console port on the device. After logging in (user: cisco, password: cisco), you are then prompted to change the password. Initial configuration is launched by typing setup. Here you can set the following:

  • IP address
  • Hostname
  • Routing
  • Access control to the sensor management
  • Communications infrastructure (communication back to the IDS manager)
  • Password for primary IDS user
  • Secure Sockets Layer (SSL) and SSH access for management

After entering these initial values, the IDS sensor can be managed from the IDS management system either embedded on the sensor or at a central location, depending on the size of your deployment.

For more details on the initial configuration of a Cisco IDS sensor, see the guide for getting started at the following URL:

Part I. Network Security Foundations

Network Security Axioms

Security Policy and Operations Life Cycle

Secure Networking Threats

Network Security Technologies

Part II. Designing Secure Networks

Device Hardening

General Design Considerations

Network Security Platform Options and Best Deployment Practices

Common Application Design Considerations

Identity Design Considerations

IPsec VPN Design Considerations

Supporting-Technology Design Considerations

Designing Your Security System

Part III. Secure Network Designs

Edge Security Design

Campus Security Design

Teleworker Security Design

Part IV. Network Management, Case Studies, and Conclusions

Secure Network Management and Network Security Management

Case Studies



Appendix A. Glossary of Terms

Appendix B. Answers to Applied Knowledge Questions

Appendix C. Sample Security Policies

INFOSEC Acceptable Use Policy

Password Policy

Guidelines on Antivirus Process


Network Security Architectures
Network Security Architectures
ISBN: 158705115X
EAN: 2147483647
Year: 2006
Pages: 249
Authors: Sean Convery © 2008-2020.
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