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Paint QR Code in C#.NET Lesson 4

Lesson 4
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Configuring Intrusion Detection and IP Preferences
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7-41
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dropped when ISA Server filters packet fragments. A common attack that uses IP fragments is the teardrop. In the teardrop attack, multiple IP fragments are sent to a server. However, the IP fragments are modified so that the offset fields within the packet overlap. When the destination computer tries to reassemble these packets, it is unable to do so. It may fail, stop responding, or restart. Enabling IP fragment filtering can interfere with streaming audio and video. In addition, Layer Two Tunneling Protocol (L2TP) over IPSec connections may not be established successfully because packet fragmentation may take place during certificate exchange.
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Blocking IP fragments is an example of a configuration option that may provide some additional security but at the cost of some functionality. If you get an exam question in which users cannot use streaming media, yet need this functionality, one of the possible explanations is that IP fragments are being blocked. By default, IP fragment blocking is not enabled on ISA Server.
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IP routing When IP routing is enabled, ISA Server sends the original network packet from one network to another. ISA Server can filter the network packet. When IP routing is disabled, ISA Server sends only the data (and not the original network packet) to the destination. Also, when IP routing is disabled, ISA Server sends each packet through the firewall in user mode. Disabling IP routing is more secure, but can also decrease router performance.
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How to Configure IP Preferences
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By default, ISA Server is configured with the most important IP preferences set. You can modify the default settings. To configure IP preferences, use the following procedure: 1. In the ISA Server Management Console tree, click General. 2. In the Details pane, click Define IP Preferences. 3. On the IP Options tab, ensure that Enable IP Options Filtering is selected, as shown in Figure 7-12. You can then configure the level of IP options filtering by denying all packets with the IP option flag configured or by denying packets with specific IP options set. By default, packets with IP options Record Route, Time Stamp, Loose Source Route, and Strict Source Route are denied.
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7
Configuring ISA Server as a Firewall
F07im12
Figure 7-12 Configuring IP Options
4. On the IP Fragments tab, shown in Figure 7-13, click Block IP Fragments to block all IP fragments. By default, this option is not enabled.
F07im13
Figure 7-13 Configuring IP Fragments
Lesson 4
Configuring Intrusion Detection and IP Preferences
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5. On the IP Routing tab, as shown in Figure 7-14, clear the check box for Enable IP Routing to disable IP routing. By default, IP routing is enabled.
F07im14
Figure 7-14
Configuring IP Routing
Practice: Configuring Intrusion Detection and IP Preferences
In this practice, you will modify the intrusion-detection configuration on ISA Server 2004. You will then test the intrusion-detection configuration.
Exercise 1: Modifying the Default Intrusion Detection
1. In the ISA Server Management Console tree, expand ISA1, then expand Configuration, and then click General. 2. In the Details pane, click Enable Intrusion Detection And DNS Attack Detection. 3. On the Common Attacks tab, ensure that Enable Intrusion Detection is selected. 4. Select Port Scan and configure ISA Server to detect after five attacks on wellknown ports. 5. On the DNS Attacks tab, select DNS Zone Transfer. Click OK. 6. Click Apply to apply the changes.
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7
Configuring ISA Server as a Firewall
Exercise 2: Testing Intrusion Detection
In this exercise, you will use the Portqry.exe utility that is included with the Windows Server 2003 Resource Kit to perform a port scan on the internal network interface of the ISA Server computer. 1. On CLIENT1, open a command prompt and configure user context to be the C:\Program Files\Windows Resource Kits\Tools folder (or in the folder where the resource kit is installed). 2. Type portqry.exe n 192.168.1.1 r 1:20. 3. On the ISA1 virtual machine, in the Microsoft ISA Server Management Console tree, click Monitoring. 4. On the Alerts tab, locate the Intrusion Detected alert. You may need to wait a few minutes for the alert to appear. Expand the alert and read the Alert Information at the bottom of the Details pane.
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