List of Figures

• 3.1 Memory arrangement
• 3.2 Diagrammatic representation of buffer overflows
• 3.3 Illustrates JMP and CALL method
• 4.1 OSI and TCP/IP protocol stacks
• 4.2 An illustration of how ARP works
• 4.3 The TCP three-way handshake
• 4.4 TCP flags and state of ports from connection to disconnection
• 4.5 An illustration of port bouncing
• 4.6 Non-blind IP Spoofing
• 4.7 A Blind IP Spoof
• 4.8 A diagrammatic representation of ICMP tunneling
• 5.1 Orientation of our network
• 5.2 Relationship between servers and clients
• 5.3 External Security - our view of the world
• 5.4 Configuration of our network
• 7.1 Packet Filtering
• 7.2 Application Proxying
• 7.3 Bus and Star configurations of Ethernet
• 7.4 Packet Switched Network
• 7.5 A Blind Spoofing Attack
• 7.6 Routers blocking NFS traffic to backbone servers from outside the backbone
• 7.7 A closer look at a router and its interfaces
• 8.1 An example of a Packet Filtering Network
• 8.2 Representation of our network
• 8.3 A combined solution, including packet filtering
• 8.4 Hierarchical authentication method of firewalling