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Using stateful filtering has several advantages. For example, stateful filtering ensures that all network traffic forwarded by the firewall is part of an existing session, or matches the rules for creating a new session. In addition, stateful filtering implements dynamic packet filtering, which ensures that specific ports are available only when a valid session exists. For example, if the Web Proxy filter requests that a Web server respond on Port 1159, ISA Server will listen on Port 1159 for only as long as the connection exists. However, stateful filtering still does not provide enough protection against the threats to network security. Many of the newest attacks occur at the application level. For example, a client computer may download malicious code in an HTTP packet that is part of a legitimate session. Only application-layer stateful inspection can block these types of attacks.

The DNS server properties dialog box allows you to configure settings that apply to the DNS server and all its hosted zones. You can access this dialog box in the DNS console tree by right-clicking the DNS server you want to configure and then selecting Properties, as shown in Figure 5-1.

ISA Server uses connection rules to keep track of sessions. Whenever a packet arrives at the server, ISA Server attempts to associate the packet with a connection rule, based on the protocol, source, and destination. A connection rule has the following attributes:

Figure 5-1

Protocol number Source (IP address and port/endpoint) Destination (IP address and port/endpoint) Source address translation (used for NAT connections) Destination address translation (used for NAT connections) Statistics (number of bytes transferred, last access time) Misc. (checksum delta, used when doing address translation)

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If the packet matches a connection rule, the packet is forwarded. If the packet does not match a connection rule, ISA Server checks the firewall access rules to determine if a new connection rule can be created. If no firewall access rule blocks the creation of the connection rule, ISA Server creates the connection and forwards the packet. If a firewall rule blocks the creation of the connection rule, the packet is dropped.

The Interfaces tab allows you to specify which of the local computer s IP addresses the DNS server should listen to for DNS requests. For example, if your server is multihomed and has one IP address for the local network and another IP address connected to the Internet, you can prevent the DNS server from servicing DNS queries from outside the local network. To perform this task, specify that the DNS server listen only on the computer s internal IP address, as shown in Figure 5-2. By default, the setting on this tab specifies that the DNS server listens on all IP addresses associated with the local computer.

In this practice, you will create roaming and preconfigured roaming user profiles and man datory group profiles. You will log on and log off a number of times. Because standard user accounts are not allowed to log on locally to a domain controller, you will begin by adding users to the Print Operators group, so that those users can log on successfully.

You can use the Firewall Kernel Mode Tool to monitor the current connections on the ISA Server computer, and to view the connection creation objects that define what new connections can be created. You can download the Firewall Kernel Mode Tool from http:// www.microsoft.com/isaserver/downloads/2004.asp.

The Forwarders tab allows you to forward DNS queries received by the local DNS server to upstream DNS servers, called forwarders. Using this tab, you can specify the IP addresses of the upstream forwarders, and you can specify the domain names of queries that should be forwarded. For example, in Figure 5-3, all queries received for the domain lucernepublishing.com will be forwarded to the DNS server 207.46.132.23. When, after receiving and forwarding a query from an internal client, the local forward ing server receives a query response back from 207.46.132.23, the local forwarding server then passes this query response back to the original querying client. The process of forwarding selected queries in this way is known as conditional forwarding.

Application-layer filtering enables the firewall to inspect the application data in a TCP/ IP packet for unacceptable commands and data. For example, a Simple Mail Transport Protocol (SMTP) filter intercepts network traffic on Port 25 and inspects it to make sure the SMTP commands are authorized before passing the communication to the destination server. An HTTP filter performs the same function on all HTTP packets. Firewalls that are capable of application-layer filtering can stop dangerous code at the edge of the network before it can do any damage.

Figure 5-3

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