Networking / Beginners

Firewall architectures

Firewalls can be configured in a number of different architectures, providing various levels of security at different costs of installation and operation. Organizations should match their risk profile to the type of firewall architecture selected.

This part of the tutorial describes the following typical firewall architectures and sample policy statements:

  • Multi-homed host

  • Screened host

  • Screened subnet
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In this tutorial:

  1. Firewall Security Policy
  2. Firewall protection
  3. Firewall architectures
  4. Multi-homed host
  5. Screened host
  6. Screened subnet
  7. Types of firewalls
  8. Packet-filtering gateways
  9. Application gateways
  10. Hybrid or complex gateways
  11. Routing versus forwarding
  12. IP spoofing
  13. DNS and mail resolution
  14. Intranet
  15. Network trust relationships
  16. Virtual private networks
  17. Qualification of the firewall administrator
  18. Remote firewall administration
  19. Firewall backup
  20. System integrity
  21. Physical firewall security
  22. Firewall incident handling
  23. Upgrading the firewall
  24. Revision/update of firewall policy
  25. Examples of service-specific policies