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The document discusses firewall implementation for a company called Acme. It describes how Acme can set up firewalls to restrict access between internal and external networks and between different internal departments. Packet filtering, proxy servers, and demilitarized zones are implemented to enforce access controls and monitor network traffic flow while protecting sensitive data. The completed Acme intranet design includes multiple firewalls configured in screened subnets and dual-homed gateways to secure remote access and internal information flows.

Economy & FinanceTechnology
1 of 41
"And of knowledge, you (mankind) have been given only a little." Surah Al-Isra‘, verse 85.
[object Object],[object Object],FIREWALLS
Introduction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Data Transmission in TCP/IP Networks: ,[object Object],TCP/IP and the OSI reference model.
What Are F IREWALLs ?? A firewall A F IREWALL is a system ( either software or hardware or both ) that enforces an access control policy between two networks.
What can F IREWALL protect against, and what they cannot? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Firewall Technology Application Level e.g. Proxy Servers Network Level e.g. packet filtering Both categories together .
F IREWALL Architectures ,[object Object],[object Object],[object Object],[object Object],[object Object]
1- Packet Filters: A packet is like a letter. TCP/IP Packet structure.
How Packet filtering works: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],(Example) Network topology for the packet filtering. (Example) Network topology for the packet filtering.
Sample packet filtering rule set. The flow of the packet filtering example. DENY
Advantages and disadvantages: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
2- Application Gateways (also, proxy gateway ) Application level gateway ? DENY
How it works: Overview of application gateway virtual connections. ALLOWED ONLY SSH
Advantages and Disadvantages of Application Gateways ,[object Object],[object Object],[object Object],[object Object]
3- Circuit Level Gateways: (e.g. Proxy and Socks servers) Circuit-Level gateway. www.companyName.com www.companyName.com
Disadvantages: ,[object Object],[object Object]
Bastion Host: ,[object Object],[object Object],[object Object],[object Object],[object Object]
3- Stateful Packet Inspection: How it works: T he logic flow of stateful packet inspection.
Advantages and Disadvantages of SPI: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Firewall Configurations 1- Screened Network (Packet Filtering Only): A simple firewall that uses a screening router
2- Dual-Homed Gateway: A dual homed host has two IP addresses.
3- Screened Host: The screened-host configuration.
Benefits & Disadvantages: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
4- Screened Subnet: The screened-host configuration. Demilitarized Zone
Benefits & Disadvantages: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Other firewall Configuration: ,[object Object],[object Object],[object Object]
The point: ,[object Object],[object Object],[object Object]
Practical F IREWALL Implementation Acme’s organizational chart shows a simple management structure with function consolidated in three main departments: production, sales/marketing, and finance. New Orleans
S ecurity I ssue: Defining the internet connection : ,[object Object],[object Object],[object Object],[object Object],[object Object]
S ecurity I ssue: Determining Who Need Access: ,[object Object],This table shows where various information inside Acme is created and how it’s shared.
S ecurity I ssue: Identifying Weak Spots in Information Flow: ,[object Object],[object Object],[object Object],The beginnings of the Acme intranet with a server for each department. I N T R A N E T
[object Object],[object Object],[object Object],[object Object],[object Object],S ecurity I ssue: Managing Remote Access:
S olutions: ,[object Object],[object Object],[object Object],[object Object],[object Object],Here is the Sales/Marketing part of the Acme intranet with the firewalls added.
[object Object],[object Object],[object Object],This diagram shows a typical sales order as it travels from the point of sale to the production and shipping facilities.
[object Object],[object Object],S ecurity I ssue: Managing Remote Access: ,[object Object],S olutions:
S ecurity I ssue: Managing Internal Access to Sensitive Information ,[object Object]
S olutions: Acme's Secure Server Net approach to controlling data in the Finance Department. (One such product is Borderware’s Secure Server Net system) Tri Homed Gateway
Additional Security Needs: ,[object Object],[object Object]
S ecurity I ssue: Security Issue: Virus Detection & Removal ,[object Object],Acme's Future: ,[object Object]
The completed Acme intranet, included the firewalls described in the chapter.

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And of knowledge, you (mankind) have been given only a little

  • 1. "And of knowledge, you (mankind) have been given only a little." Surah Al-Isra‘, verse 85.
  • 2.
  • 3.
  • 4.
  • 5. What Are F IREWALLs ?? A firewall A F IREWALL is a system ( either software or hardware or both ) that enforces an access control policy between two networks.
  • 6.
  • 7. Firewall Technology Application Level e.g. Proxy Servers Network Level e.g. packet filtering Both categories together .
  • 8.
  • 9. 1- Packet Filters: A packet is like a letter. TCP/IP Packet structure.
  • 10.
  • 11. Sample packet filtering rule set. The flow of the packet filtering example. DENY
  • 12.
  • 13. 2- Application Gateways (also, proxy gateway ) Application level gateway ? DENY
  • 14. How it works: Overview of application gateway virtual connections. ALLOWED ONLY SSH
  • 15.
  • 16. 3- Circuit Level Gateways: (e.g. Proxy and Socks servers) Circuit-Level gateway. www.companyName.com www.companyName.com
  • 17.
  • 18.
  • 19. 3- Stateful Packet Inspection: How it works: T he logic flow of stateful packet inspection.
  • 20.
  • 21. Firewall Configurations 1- Screened Network (Packet Filtering Only): A simple firewall that uses a screening router
  • 22. 2- Dual-Homed Gateway: A dual homed host has two IP addresses.
  • 23. 3- Screened Host: The screened-host configuration.
  • 24.
  • 25. 4- Screened Subnet: The screened-host configuration. Demilitarized Zone
  • 26.
  • 27.
  • 28.
  • 29. Practical F IREWALL Implementation Acme’s organizational chart shows a simple management structure with function consolidated in three main departments: production, sales/marketing, and finance. New Orleans
  • 30.
  • 31.
  • 32.
  • 33.
  • 34.
  • 35.
  • 36.
  • 37.
  • 38. S olutions: Acme's Secure Server Net approach to controlling data in the Finance Department. (One such product is Borderware’s Secure Server Net system) Tri Homed Gateway
  • 39.
  • 40.
  • 41. The completed Acme intranet, included the firewalls described in the chapter.