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that you want to provide to the outsideworld. For example, if you want to log in to yourcomputer from another system, select the SSHServer check box. If you re running an ApacheWeb server, select the Web Server check box. Figure 34-1:The Mandrake Firewall Builder. If you need to temporarily disable your firewall, select the Everything (No Firewall) check box drakfirewallis kind enough to remember youroriginal settings so that you can restore your fire- wall again later. 4.When you re finished, click OK to save yourchanges. When you save your changes, drakfirewallsavesyour choices to a set of configuration files in the/etc/shorewalldirectory and executes a sequenceof iptablescommands that configures netfilteraccording to your preferences. Mandrake Linux actually uses twofirewall builders, one layered atop the other. drakfirewall(the toolwe just described) is a very high-level firewallbuilder it s very simple, but not very flexible. Under the hood, drakfirewalldrives another fire- wall builder called Shorewall. You can find moreinformation about Shorewall at www.shorewall.net. system. netfilter is part of the Linux kernel youcan configure netfilter with the iptablescommand. Notice that we said that you canconfigure netfilterwith the iptablescommand, not that you should. Creating a firewall by typing in a bunch of iptablescommands is something best left to the propellerheads. Instead, you should use a firewall builder. A firewallbuilder is a tool that (usually) asks you a series ofquestions about how you use your computer andthen runs a sequence of iptablescommands onyour behalf. A good firewall builder will store yourchoices in a set of one or more configuration filesand then arrange for the corresponding iptablescommands to execute each time you boot yourcomputer. You can find a variety of firewall builders on theWeb. Some are designed to create a simple firewallas quickly as possible; others are less friendly, butgive you more control over the security of your sys- tem. SuSE, Mandrake, and Fedora each come with afirewall builder (and they re all different). Setting up a simple firewall in Mandrake LinuxIn keeping with Mandrake s reputation for simplicity, drakfirewall(the Mandrake firewall builder) makesit very easy to configure a simple firewall. To run theMandrake firewall builder, follow these steps: 1.Open the main menu and choose System. Configuration.Configure your computer. The Mandrake Control Center opens. 2.Choose Security.Firewall. The drakfirewallconfiguration editor opens, asshown in Figure 34-1.3.Use the check boxes to configure your firewall. Start out by clearing each check box that willlock your system down so that outsiders can tget through your firewall. Then, check each42_
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