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Introducing Firewalls
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Firewalls are certainly nothing new in the computing world, but you hear more about them today than ever before. With security concerns at an all time high, numerous firewall products are available on the market, with a number of third-party software products targeted to the home user or small network. With ICF s inclusion in Windows XP, you know that these security concerns are valid and should be considered by any Internet user or network user.
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What Is a Firewall
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A firewall is a piece of hardware or software placed between two networks or computers to keep one safe from the other.
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2: Internet Networking
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Part 2: Internet Networking
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The most common example concerns a private local area network (LAN) and the public Internet. A firewall can be used between the two so that users on the private network can access the Internet, but Internet users cannot access the private network. In the following schematic illustration, the LAN can reach across the firewall to draw upon the Internet, but activity originating from the Internet cannot cross over the firewall and compromise the LAN s security.
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Network Protected by a Firewall
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Firewalls can also be configured to prevent LAN users from accessing the Internet or to restrict TCP/IP traffic so that only certain ports can transmit across the firewall. Firewall solutions can be in the form of either hardware or software. Each has its own advantages and disadvantages, and staunch firewall enthusiasts might argue for one or the other. However, from a networking person s point of view, both hardware and software solutions can be very effective ways to protect your network. ICF is a softwarebased firewall solution.
For more information on firewalls and their use, as well as best practices related to ICF and other firewall products, be sure to read 20, Maintaining Network Security.
2: Internet Networking
5
Understanding Internet Connection Firewall
ICF is readily available in Windows XP and works with any network connection. Before getting into the specifics of ICF configuration, it is important to understand how ICF works, the features it provides, and how it can be used in a home or small office network. It is important to note that ICF was specifically developed to protect modem and broadband Internet connections it was not designed for workstations residing on
5: Using Internet Connection Firewall
large networks where other types of Internet access are used. In those networks, either firewall hardware or software on Windows 2000 servers is used to control and manage Internet access. ICF, however, was designed to support either a stand-alone computer (that is, one not providing a shared connection to other systems) or a computer that is providing a shared Internet connection to other computers on a small network.
For more information about using a Windows XP computer to share an Internet connection with multiple computers, see Using Internet Connection Sharing, page 301.
How ICF Works
ICF works with an Internet connection to provide security from external attacks. ICF uses a method of protection known as the table method, in which a table or list of outbound and inbound IP addresses is maintained. Consider first how ICF works when a standalone computer uses ICF. You enable ICF on the Internet connection, as detailed in Activating and Configuring ICF on page 124. Using your Web browser, you request a Web page. ICF makes an entry in its outbound connections table noting the IP address of the site you are requesting. When the Web page is served back to the computer, ICF examines the IP packets and looks at the IP addresses. If ICF finds a match for the sending address in the list of destination addresses for outbound traffic, the assumption is that you requested the IP traffic and therefore ICF allows the traffic to enter the computer. However, if any traffic arrives at the firewall that does not match a destination IP address listed in the table, the IP packets are dropped and are not processed by the computer. ICF is considered a stateful firewall because it examines all traffic passing in and out of the firewall and makes decisions concerning that traffic as needed. In other words, ICF considers the current state of the packets and determines whether they are allowed or not based on the ICF table, as the following diagram shows.
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