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For most users, Firestarter s default inbound traffic policy will be perfectly acceptable. It configures the firewall to disallow all uninvited incoming data connection, apart from certain diagnostic tools, such as ping, traceroute, and so on. You can choose to disallow those as well, as described shortly in the Turning Off Diagnostic Services section. You might wish to allow an incoming connection if you intend to connect to your computer via SSH from a remote location or if you have a shared folder created for other computers in your office. It s a must if you re running the BitTorrent file sharing application. Additionally, if you run a web, e-mail, or other type of server on your computer, you will need to allow the correct type of incoming connection here. Here s how to set inbound connection rules: 1. In the Firestarter main window, click the Policy tab. Select Inbound Traffic Policy in the Editing drop-down list. 2. Right-click in the second box on the Policy tab (with the headings Allow Service / Port / For), and then select Add Rule. 3. The Add New Inbound Rule dialog box appears. In the Name drop-down list, select the type of outgoing connection you want to allow, as shown in Figure 9-5. To allow others to access shared folders on your computer, select Samba (SMB). To allow SSH or BitTorrent connections to your computer, select the relevant entry from the list. Selecting the service will automatically fill in the Port box, which you shouldn t alter unless you know exactly what you re doing.

Figure 9-5. Creating an inbound rule enables computers to connect to your PC uninvited. 4. If you know the IP address of the computer that s going to make the incoming connection, you can click the IP Host or Network radio button, and then type in that address. However, , the default of Anyone will allow anyone using any IP address to connect to your computer. 5. Click Add. Back in the main Firestarter window, click the Apply Policy button.

Note You ll need to return to Firestarter whenever you activate new services on your computer. For

example, in 12, we will look at accessing Windows shares across a network, and you ll need to enable SMB incoming and outgoing access for this to work. In 34, we will look at using the SSH service, which will have to be allowed through the firewall. In other words, securing your computer isn t something you can do once and then forget about. It s a continual process.

By default, Firestarter allows all types of outgoing connections and, as with its incoming connections policy, this is by no means a bad choice for the average user. It s certainly the option that involves the least fuss. However, by opting to go with a restrictive traffic policy, you can completely control what kind of data leaves your computer. Any type of data connection

that isn t authorized will be refused; as far as the program sending the data is concerned, it will be as if your computer did not have a network or Internet connection. Here s how to set outbound connection rules: 1. In the Firestarter main window, click the Policy tab. Select Outbound Traffic Policy in the Editing drop-down list. 2. Click the Restrictive by Default, Whitelist Traffic radio button. 3. In the second empty box at the bottom of the Policy tab, right-click and select Add Rule. 4. The Add New Outbound Rule dialog box appears. Select the type of data connection you wish to allow. At the very least, you should select HTTP This will allow your web . browser to operate correctly (it s also needed to allow the Synaptic Package Manager and Update Manager programs to work). You should also add a rule for POP3 and another for SMTP, without which your e-mail program won t work. Selecting the type of service will fill in the Port box automatically. You shouldn t alter this unless you know what you re doing. 5. Click the Add button to add the rule. Back in the Firestarter main window, click Apply Policy. 6. Test your settings with a program that uses the services you ve just authorized.

Caution If you created an inbound rule, you ll need to create a matching outbound rule. If you created an

incoming rule for BitTorrent, for example, you ll need to create an outgoing rule for BitTorrent, too.