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right are certain floating palettes, while in the middle is the main image-editing program window. This can be maximized to fill the Desktop, and this is a good idea if you want to make serious use of GIMP. To open a picture, choose File Open and select your image from the hard disk. After an image file is opened, you can manipulate it by using the tools on the toolbar (which are similar to those found in other image editors). On the bottom half of the main program window are the settings for each tool, which can be altered, usually via click-and-drag sliders. To apply filters or other corrective changes, right-click anywhere on the image to bring up a context menu with a variety of options. For example, simple tools to improve brightness and contrast can be found on the Colors submenu, as shown in Figure 11-10.

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

Summary

option routers 192.5.5.1; option subnet-mask 255.255.255.224; option broadcast-address 192.5.5.31; default-lease-time 600; max-lease-time 7200;

10, you 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 25, you 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 2 In the Firestarter main window, click the Policy tab Select Outbound Traffic Policy in the Editing drop-down list Click the Restrictive by default, whitelist traffic radio button This option means that by default all outbound traffic will be blocked.

Hosts which require special configuration options can be listed in host statements. If no address is specified, the address will be allocated dynamically (if possible), but the host-specific information will still come from the host declaration.

You need to add to a whitelist the traffic that you want to allow In the second empty box at the bottom of the Policy tab (which has the Allow Service/ Port/For headings), right-click and select Add Rule The Add new outbound rule dialog box appears In the Name drop-down list, select the type of data connection you want 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 Ubuntu Software Center and Update Manager programs to work) HTTPS should also be allowed this is the secure version of HTTP used to access the likes of online banking sites, online shopping services, and some online e-mail services You should also add a rule for POP3 and another for SMTP, without which your e-mail program won t work.