c# qr code generator open source Configuring ISA Server as a Firewall in C#.NET

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Configuring ISA Server as a Firewall
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Network Perimeter Configuration Options
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Perimeter networks provide an additional layer of network security by protecting publicly accessible servers from unauthorized access while also partially isolating these servers from the internal network. The design of a secure network perimeter includes protection for the internal network as well as for servers that must be accessible from the Internet. There are three broad types of network perimeter configurations:
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Bastion host In this configuration, there is only a single firewall between the Internet and the internal network, as shown in Figure 7-6. The bastion host acts as the main connection for computers on the internal network that are accessing the Internet. As a firewall, the bastion host is designed to defend against attacks that are aimed at the internal network. A bastion host uses two network adapters, one connected to the internal network and one connected to the Internet. This configuration physically isolates the internal network from potential intruders on the Internet. However, the bastion host is only a single line of defense between an internal network and the Internet.
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Internal Network Internet Firewall Web Server
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Figure 7-6 A bastion host perimeter configuration uses a single firewall with two network interfaces
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Three-legged configuration A three-legged configuration creates a perimeter network that gives users on the Internet limited access to network resources on the perimeter network while preventing unwanted traffic to computers that are located on the internal network (Figure 7-1 shows ISA Server deployed in a threelegged perimeter configuration). A three-legged configuration uses a firewall with three network adapters one connected to the internal network, one connected to a perimeter network, and one connected to the Internet. Frequently, each server in the perimeter network has IP addresses that are routable on the Internet, so the firewall routes traffic to the perimeter network. The firewall screens and routes packets to the perimeter as defined by the firewall configuration. However, the firewall computer does not allow direct access to resources that are located on the internal network. One advantage of a three-legged firewall is that it gives you a single point of administration to configure access to both your perimeter network
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Lesson 3
Implementing Perimeter Networks and Network Templates
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and your internal network. A disadvantage of a three-legged firewall is that it presents a single point of access to all parts of your network. If the firewall is compromised, both the perimeter network and the internal network might be compromised.
Back-to-back configuration This perimeter network configuration places the perimeter network between two firewalls, as shown in Figure 7-7. The two firewalls are connected to the perimeter network with one firewall connected to the Internet and the other firewall connected to the internal network. In this configuration, there is no single point of access from the Internet to the internal network. To reach the internal network, an attacker would need to get past both firewalls. It is common to use two different firewall vendors in this configuration for maximum security. This dual-vendor configuration prevents an exploit on one firewall from being easily exploited on both firewalls. A back-to-back configuration allows the creation of very granular rules for internal and external access to the network. For example, you can create rules that allow only HTTP and SMTP traffic access to the screened subnet from the Internet and rules that allow only Internet Protocol security (IPSec) encrypted traffic access to the back-end servers on the internal network from the screened subnet.
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Figure 7-7
A back-to-back perimeter configuration uses multiple firewalls
Caution
One of the more common reasons for firewall security breaches is incorrect configuration of the firewall. Regardless of how good your firewall is, it is only as secure as your configuration. One of the problems with deploying a back-to-back perimeter network is that the firewall configurations can be quite complex. The problem can be compounded if you deploy two firewalls and you are not thoroughly familiar with both firewalls. If you do not have the training or experience to configure two firewalls, then consider becoming an expert in only one firewall and using just that firewall. A single firewall with a secure configuration is more secure than two incorrectly configured firewalls.
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