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ISA Server does not support the direct configuration of a packet filter. To block all connection attempts from a specific host, or to allow a specific protocol from a particular host you must configure an access rule. Both access rules and network rules are processed by ISA Server before network traffic is passed through the firewall. Check the configuration of both types of rules when troubleshooting network access. ISA Server network templates simplify the configuration of the ISA Server settings. However, the templates also enable only outbound access and have a limited set of configuration options. You should have a clear idea what each template does so that you can troubleshoot any problems with the template. Blocking IP fragments is an example of a configuration option that may provide some additional security but at the cost of some functionality. If users cannot use a streaming media application one of the possible explanations is that IP fragments are being blocked. By default, IP fragment blocking is not enabled on ISA Server. HTTP Web filter rules are applied on a per rule basis. Just because you have configured filtering on one rule, does not mean that filtering is applied to all rules. If you have multiple rules that grant access to the Internet, you need to configure the filter for all the rules.

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intrusion detection A means to detect when an attack is attempted or in progress against a network. If you detect an intrusion attempt early enough, you may be able to prevent a successful intrusion. network rule Defines how network packets will be passed between networks. Network rules determine whether there is a relationship between two network entities and what type of relationship is defined. network template A set of ISA Server configuration options that define networks and network sets, network rules, access rule elements, and access rules. packet filtering Filters network packets by inspecting and allowing or denying the IP packets based on information in the IP packet network layer header. perimeter network A network that is separated from an internal network and the Internet. Perimeter networks allow external users to gain access to specific servers that are located on the perimeter network while preventing direct access to the internal network.

println("sPublic = {this.sPublic}"); println("sPublicReadDefault = " "{this.sPublicReadDefault}"); println("sPublicReadPackage = " "{this.sPublicReadPackage}"); println("sPublicInitProtected = " "{this.sPublicInitProtected}"); } }

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6. On the Program page, select All Programs, and click Next. 7. On the Protocol And Ports page, in the Protocol Type drop-down list, select TCP. In the Local Port drop-down list, select Specific Ports. In the Local Port text box, type 80. Click Next. 8. On the Scope page, leave the default settings, and click Next. 9. On the Action page, select Allow The Connection, and click Next. 10. On the Profile page, click Next to accept the default settings. 11. On the Name page, type Web Server Rule in the Name text box, and click Finish. 12. Right-click Web Server Rule in the list of Inbound Rules, and select Properties. 13. Click the Scope tab. In the Remote IP Address area, select the These IP Addresses option, and click Add. 14. In the This IP Address Or Subnet text box, shown in Figure 8-12, type 10.10.10.0/24.

stateful filtering Filters network packets by using information about the TCP session to determine if a packet should be blocked or allowed through the firewall. Web filters Extend the functionality of the firewall service in ISA Server by providing advanced filtering capability for HTTP packets as they pass through ISA Server.

Figure 8-12

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Listing 3.16 shows a class with instance variables displaying various types of access visibility. Note that the class is in package jfxia.chapter3.access. To test it we need some further sample code such as in listing 3.17.

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15. Click OK twice to close the IP Address dialog box and the Web Server Rule Properties dialog box. Practice 3: Exporting and Importing a Windows Firewall with Advanced Security Policy In this practice, you will export the current configuration, make alterations to the configuration, and then restore the configuration. Because you have made changes to the firewall rules in Practices 1, 2, and 3, you would not want to reset to the defaults because that would mean losing the changes already made. Reimporting the exported firewall configuration brings you back to the start of Practice 4 without having to perform the prior practices again. To complete the practice, perform the following steps:

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