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ISA Server also uses application-layer filtering to determine whether a packet is allowed or not. Application-layer filtering examines the actual content of a packet to determine if the packet can be forwarded through the firewall. An application filter opens the entire packet and examines the actual data in it before making a forwarding decision. For example, a user on the Internet may request a page from the internal Web server using the Hypertext Transfer Protocol (HTTP) GET command. When the packet arrives at the firewall, the application filter inspects the packet and detects the GET command. The application filter checks its policy to determine if the GET command is allowed. In most cases, the GET command is allowed and the packet is forwarded to the internal Web server. If the user sends a similar packet to the Web server, but uses the HTTP POST command, ISA Server again examines the packet. Because the POST command is used to write information to the Web server, the command is likely to be blocked. ISA Server notices the POST command, determines that the command is not allowed by the firewall policy, and drops the packet. The HTTP application filter provided with ISA Server 2004 can check for any information in the data, including virus signatures, Uniform Resource Locator (URL) length, page header content, and file extensions. ISA Server includes other application filters for securing other protocols and applications in addition to the HTTP filter.

Extended Service Set An extended service set (ESS) represents a network in which multiple APs (and thus multiple BSSs) are used, as shown in Figure 15-18. This allows for increased mobility because stations can move from one BSS to another. APs can be interconnected with or without network cable (although most of the time they are connected to one another with cables).

Figure 15-18 An ESS is a connection of multiple BSSs, the DS serving as the logical link between BSSs.

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Virtually all firewalls available today perform packet and stateful filtering. However, many of these firewalls do not have the ability to perform application-layer filtering. And yet application-layer filtering has become one of the most critical components in securing a network perimeter. For example, virtually all organizations allow HTTP traffic (port 80) from the internal network to the Internet. As a result, many applications can now be tunneled through HTTP. For example, MSN Messenger and some peer-to-peer file sharing applications, such as Kazaa, use HTTP as a protocol. HTTP traffic can also include viruses or other malicious code. The only way to block unwanted network traffic, while still allowing legitimate HTTP usage, is to implement a firewall that is capable of application-layer filtering. The application-layer firewall can examine the contents of packets and block traffic based on HTTP methods (to block applications) or signatures (to block viruses, malicious code, or applications). ISA Server 2004 is exactly the type of sophisticated application-layer firewall that has become critical in protecting networks.

Distribution System The distribution system (DS) is a logical component used to interconnect BSSs in an ESS. The DS provides distribution services to allow for the roaming of STAs between BSSs.

Almost all organizations provide Internet access for their users. The use of the World Wide Web as a source of information and as a communication tool means that most organizations cannot afford to be without access to it. At the same time, ensuring that

Although the architectural elements of 802.11 networking sound a bit intimidating, it is important to understand the underlying components of the two modes in which you can configure a wireless client to operate: ad-hoc mode, in which there is no AP and infra, structure mode, in which an AP is used. An ad-hoc network offers fewer configuration options and is sometimes used in small workgroup environments. An infrastructure network provides greater security and configurability and is the most common mode for wireless networking.

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When a wireless network is used, security becomes of greater concern. On traditional wired networks, there is a certain level of security to be had simply because you can physically protect the networking cables. On a wireless network, you cannot physically protect the radio frequencies used and so must rely on logical protection in the form of authentication and encryption.

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ISA Server provides two options for logging firewall activity:

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MSDE logging This method is the default logging method for firewall and Web activity. ISA Server writes log records directly to a Microsoft SQL Server Desktop Engine (MSDE) database to enable online sophisticated queries on logged data.

One of the biggest threats to wireless networks is that operating systems such as Windows XP Professional make it very easy to locate and connect to wireless networks so easy, in fact, that people often connect to unsecured wireless networks without even realizing that it has happened. There are also more deliberate threats to wireless networks. Attackers can gain access to unsecured (or improperly secured) networks by connecting with their wireless stations, or even by installing unauthorized APs on an existing wired network. Once connected, attackers can inspect, modify, or damage vital resources. Fortunately, there are a number of ways to secure a wireless network against such threats. These methods are the focus of the next few sections.

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