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Certain network tools can be misused by crackers in order to break into a computer or just cause it problems. In the past, the traceroute and ping tools, among others, have been used to launch denial-of-service (DoS) attacks against computers. Ubuntu is set to allow these tools to operate by default. If you want to adopt a belts-andbraces approach to your computer s security, you can opt to disable them. If you don t know what ping and traceroute are, you re clearly not going to miss them, so there will be no harm in disallowing them. Here s how: 1. In the Firestarter main window, click Edit Preferences. 2. On the left side of the Preferences window, click ICMP Filtering. Then click the Enable ICMP Filtering check box, as shown in Figure 9-6. Don t put a check in any of the boxes underneath, unless you specifically want to permit one of the services.
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CHAPTER 9 HOW TO SECURE YOUR COMPUTER
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Figure 9-6. By deactivating traceroute, ping, and other services, you can add extra protection to your PC. 3. Click the Accept button to finish.
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PARANOIA AND SECURITY
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There s a fine line between security and paranoia. Using Firestarter gives you the opportunity to ensure your system is secure, without needing to constantly reassess your system for threats and live in fear. When considering your system security, remember that most burglars don t enter a house through the front door. Most take advantage of an open window or poor security elsewhere in the house. In other words, when configuring your system s security, you should always select every option and extra layer of security, even if it might not appear to be useful. You should lock every door and close every window, even if you don t think an attacker would ever use them. Provided a security setting doesn t impact your ordinary use of the computer, you should select it. For example, deactivating the ping response of your computer might sound like a paranoid action, but it s useful on several levels. First, it means your computer is less easy to detect when it s online. Second, and equally important, it means that if there s ever a security flaw in the ping tool (or any software connected with it), you ll be automatically protected. This illustrates how you must think when configuring your system s security. Try to imagine every situation that might arise. Remember that you can never take too many precautions!
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CHAPTER 9 HOW TO SECURE YOUR COMPUTER
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In this chapter, we ve looked at what threats your system faces and how security holes can be exploited by malicious interests. You learned about measures you can take to protect your system, such as updating it online and configuring the system s firewall. We also discussed some common-sense rules you can follow to keep your system safe. In the next chapter, we move on to looking at how your Ubuntu system can be personalized and how to set up everything to suit your own preferences.
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Personalizing Ubuntu: Getting Everything Just Right
f you ve read this book from 1, by this stage, you no doubt have become comfortable with Ubuntu. You ve started to realize its advantages and are on the way to making it your operating system of choice. But things might still not be quite right. For instance, you might find the color scheme is not to your tastes. Or perhaps you feel that the mouse cursor moves a little too fast (or too slowly). Maybe you simply want to stamp your own individuality on your system to make it your very own. That s what this chapter is all about. We look at personalizing Ubuntu so that you re completely happy with your user experience.
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