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In all cases, a DNS server configured for forwarding uses forwarders only after it has determined that it cannot resolve a query using its authoritative data (primary or sec ondary zone data) or cached data.

Application-layer filtering can be used to stop attacks from sources such as viruses and worms. To the packet-filtering firewall, most worms look like legitimate network traffic. The headers of the packets are identical in format to those of legitimate traffic. It is the payload that is malicious; only when all the packets are put together can the worm be identified as malicious code, so these exploits often travel straight through to the private network because the firewall allowed what appeared to be legitimate application data.

To specify how long the forwarding server should wait for a response from a forwarder before timing out, on the Forwarders tab, enter a value in the Number Of Seconds Before Forward Queries Time Out text box. The default setting is 5.

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If you are concerned that attacks may be taking place to discover user passwords, or to troubleshoot authentication problems, you can configure an auditing policy that will create entries in the Security log that may prove illuminating.

When to Use Forwarders In some cases, network administrators might not want DNS servers to communicate directly with external servers. For example, if your organiza tion is connected to the Internet by means of a slow wide area link, you can optimize name resolution performance by channeling all DNS queries through one forwarder, as shown in Figure 5-4. Through this method, the server cache of the DNS forwarder has the maximum potential to grow and reduce the need for external queries.

An application-layer firewall has become critical in securing a network from attack For years, companies deployed firewalls that provide packet filtering and stateful filtering Many excellent firewalls that provide this level of filtering are available The problem is that these firewalls are so good that attackers no longer bother to attack the firewall at the network layer, but at the application layer, where many of the most serious security breaches have occurred Attacks at the application layer use legitimate application-level protocols and ports To a firewall that performs only packet and stateful filtering, the network packets appear to be normal application data For example, an SMTP message that contains a virus is just an SMTP message with an attachment Or the Web page that downloads a worm to your computer is just a series of HTTP packets.

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The problem is not evident until the application client or server removes the network layer information and starts processing the application data Most organizations that I work with realize the need for an application-layer filter for e-mail and have deployed advanced SMTP filtering servers that can examine the contents of every e-mail message and block messages based on message contents or attachments These organizations have become increasingly aware of the need for the same level of filtering for HTTP packets HTTP has become the protocol of choice for many applications HTTP traffic is allowed through virtually every firewall and every user s computer already has the HTTP client software installed This makes using HTTP very attractive to an attacker.

Forwarding DNS server (forwards to 192.168.0.1)

An important step in securing your network from these types of attacks is to ensure that the Web browsers installed on your client computers are fully patched and configured for optimal security The second way to secure your network against this type of attack is to implement a firewall that can examine each HTTP packet and block the packet based on the application data ISA Server 2004 is one of the best application-layer firewalls available today..

Forwarding DNS server (forwards to 192.168.0.1)

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The following policies are located in the Computer Configuration, Windows Settings, Security Settings, Local Policies, Audit Policy node of Group Policy Object Editor (or the Local Security Policy snap-in). You can configure auditing for successful or failed events.

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