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ICF Considerations
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Internet Connection Firewall (ICF) is a stateful filter firewall based on service defini tions and is available on Windows XP Professional and Windows Server 2003. ICF pro vides logging and is capable of providing inbound access to services running on the computer, such as a Web server. It is an excellent security resource on a desktop sys tem. It is not, however, an enterprise solution, primarily because it does not provide any egress filtering capabilities.
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TCP/IP Filtering Considerations
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TCP/IP filtering can be configured on the network interface. It is stateless packet filter ing and protocol filtering. It is rarely recommended because there are many other solu tions that are superior.
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Considerations for IPSec in Transport Mode
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IPSec policies can also be created to protect traffic between Windows computers on a network. Windows 2000, Windows Server 2003, and Windows XP Professional have IPSec built in. A client for Layer Two Tunneling Protocol/Internet Protocol security (L2TP/IPSec) is provided as a download for Windows 98 and Windows NT 4.0. IPSec
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Designing the Network Infrastructure for Physical Security
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communications provide machine authentication, privacy, integrity, and protection from replay-based attacks. For more information, see Lesson 3: Designing Security for Internal Data Transmissions, later in this chapter.
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Considerations for Remote Access and RADIUS Servers
Remote access to internal networks can be provided via dial-up and network resources by using Windows Routing and Remote Access Services (RRAS) and Windows Internet and Authentication Service (IAS). Dial-up access provides for user authentication and data encryption. Remote access policies can restrict who can access the network, when they can access it, and by what means. Internet Authentication Services can centralize authentication and accounting (auditing) information for many RRAS servers.
Considerations for Network Access Quarantine Control
Network Access Quarantine Control is a new feature of Windows Server 2003. It can be
used to delay remote connections while a script is run to determine whether the com
puter meets criteria designated in an administrative script. If the criteria are met, the
connection proceeds in a normal manner. If the criteria are not met, the user can be
redirected to a location where instructions are given on how to meet the criteria and
information is given as to where the proper tools can be downloaded and installed.
Alternatively, the user can be given instructions on how to comply and the connection
can be terminated upon providing the instructions. Items that might be tested include
the following:
The correct service pack
Correct and updated antivirus software and signatures
Routing disabled
Firewall software installed
Password-protected screen saver
See Also
For more information about Network Access Quarantine Control, see 7.
Guidelines for Selecting and Using Effective Border Controls
Just understanding what current controls can do suggests where they are appropriate. However, there s more to the process of selecting and using effective border controls than just being able to define them. Follow these guidelines to select and use border controls:
Determine which controls are already in place and whether they are effective and properly managed. The security architect will not often have the opportu nity of starting from scratch and must learn to deal with inherited structures.
Lesson 1
Designing Network Border Control
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Often, however, there is nothing wrong with inherited structures except that they are ill-managed or improperly configured.
Document the current border controls. Many organizations have acquired various security devices with little thought to the necessary management and training required for them to work properly. It s as if they thought firewalls were like seat belts if networks had them, people would eventually use them, and using them was just as easy as buckling up. In documenting current border controls, determine the following information about each control:
Manufacturer, make, model, and serial number Knowing this information will assist in understanding the control s configuration and capabilities and in locating support. Training received Find out who received training on the product and when. Product documentation Find out the location of product documentation and information about its availability. Use and location Determine what the control is used for and where it is used (for example, external firewall of DMZ, or IDS in DMZ). Configuration Each device configuration will be different, but thorough documentation is necessary to compare what is to what should be.
When selecting border controls and designing their use, strike a balance between the needs of employees, customers, and partners to access and manipulate the organization s data and the organization s need to protect its data. If secure access, which provides acceptable protection, cannot be designed and implemented, consider disallowing external access. Consider the location of the VPN/remote access server. Choices include locating the VPN server outside the firewall (after which accepted communications are then given access through the firewall), locating the VPN server in the DMZ and tunneling VPN traffic through the external firewall, and locating the VPN server directly on the internal network with its own connection to the Internet. While its location in the DMZ can provide the VPN server with protection, some see loca tion on the internal network as a better choice. With this approach, the VPN server is protected by configuring packet filters or IP protocol filters using IPSec directly on the VPN server and allowing only VPN traffic to connect. Both scenarios can be secured, but it s important to note that traffic that does not pass through a firewall or other border device after leaving the VPN server is not filtered or inspected. Trojan horses, viruses, and other malware, as well as attacks, can transit into the network. The VPN server is only meant to authenticate the user, and possibly authenticate the computer and protect the data in transit, not to inspect the data once it has arrived.
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