Firewall Approach to Internet Security - Tutorial

Table of Contents

• Firewall Approach Overview
  • Concepts
  • Why Firewalls?
  • Further Study
• Firewall Components
  • Section Overview
  • Filtering Routers
    • How packets are filtered out?
    • What information is used for filtering decision?
    • Examples
      • Protecting from the IP spoofing of internal addresses
      • Allowing only electronic mail traffic
    • Why Filtering Routers are not enough?
    • Further Study
  • Application Gateways - Proxies
    • Overview
    • How proxy program works?
    • How  external client is enforced to contact proxy server?
    • How  internal client is enforced to contact proxy server?
    • Further Study
• Firewall Architectures
  • Section Overview
  • Screening Router Architecture
  • Dual-Homed Host Architecture
  • Screened Host Architecture
  • Screened Subnet Architecture
  • Further Study
• References