Hacker Attack P2

I Know Where You LiveAnother feature of a high-speed connection is that you never have to dial into the Internet. Your high-speed connection is always on, like TV. But here’s the rub: with an always-on connection, your virtual door is always open to the big, bad outside world. Broadband connections give you a permanent Internet (IP) address. The Internet address to your computer never changes. Stop and think of the implications: To a hacker, it’s the equivalent of I know where you live! When you use the old slow, modem dial-up Internet connection, a different IP address is dynamically assigned...
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Hacker Attack P2 Like Spiders to Flies 5 I Know Where You Live Another feature of a high-speed connection is that you never have to dial into the Internet. Your high-speed connection is always on, like TV. But here’s the rub: with an always-on connection, your virtual door is always open to the big, bad outside world. Broadband connections give you a permanent Internet (IP) address. The Internet address to your computer never changes. Stop and think of the implications: To a hacker, it’s the equivalent of I know where you live! When you use the old slow, modem dial-up Internet connection, a different IP address is dynamically assigned each time you dial in. When the phone connection is broken because you shut down your browser or e-mail reader program, or turn off the computer—that tem- porary IP address evaporates. But with the new high-speed connections, you get a stable, lasting IP address, just like your permanent phone number or house address. Chapter 7 goes into detail about the dangers you face from these new connections, but be aware that your personal exposure to hackers becomes considerably greater when you open your computer to the Internet world with an unchanging IP address that’s always “on.”Free Long-Distance Phone Calls for Everyone!Here’s How…The IP address is a unique number assigned to each computer on theInternet. For example, when you click a link to go to a Web site, thewords in the link (such as microsoft.com) are automatically translatedinto an IP address. The human-friendly words of an Internet addresslike microsoft.com are changed into the computer-friendly digits of anIP address. IP addresses are made up of four numbers, separated byperiods. Here’s a typical example: 212.53.166.236Sometimes you might want to give a friend your IP address (if youhave a permanent one). For instance, you might want to save yourselfa lot of money if you have friends overseas. You can use Microsoft’sNetMeeting utility to send typed “chat” messages back and forth; tosend files or graphics; or if you have a sound card, plug a microphone6 Chapter 1 • Danger on the Internet Free Long-Distance Phone Calls for Everyone! Here’s How… (continued ) into it (a cheapie from Radio Shack or CompUSA works just fine) and you can have long-distance phone conversations with a similarly equipped friend anywhere in the world. These calls cost nothing and you can talk as long as you want. I recently spent an hour talking with a friend in Athens, Greece. Imagine how much that would have cost via a traditional telephone. There can be a little echo, but ordinary phone calls aren’t exactly high fidelity either. NetMeeting is packaged with Internet Explorer 5, which in turn is pack- aged with Windows 98 and 2000. So to run NetMeeting, click your Start but- ton, then click Programs and scroll down until you see NetMeeting. (If you don’t see it there, look in Start ➢ Programs ➢ Accessories ➢ Internet Tools.) If you haven’t used it before, it will take you through the setup process. Once it’s installed, use it to make a call to your friend in Athens by choosing Call ➢ New Call from its menus. Type in your friend’s IP address, as shown in the following graphic: Exploring the Three Windows Protocols 7 Free Long-Distance Phone Calls for Everyone! Here’s How… (continued ) You or your friend must find out your (or their) IP address, so it can be typed into NetMeeting and make the connection. To find out what your IP address is, first connect to the Internet using your browser or e-mail program. Once you’re connected, click Windows’s Start button, then choose Run, and type WINIPCFG. Click the OK button, and the Windows IP utility executes, as shown in the following graphic:Exploring the Three Windows Protocols Windows includes three primary protocols (sets of rules) that facilitate communication between computers. The three protocols are IPX/SPX, NetBEUI, and TCP/IP. IPX/SPX A set of two protocols that permit network interconnections for people who use Novell’s NetWare clients and servers. NetBEUI (NetBIOS Extended User Interface) An augmentation of NetBIOS, a utility that facilitates LAN communications. NetBEUI was originally created by IBM, but has since been embraced by Microsoft for use with NT and Windows 95/98. TCP/IP This familiar Internet standard can also be used in LANs and WANs, as well as the main communication over Internet connections. The TCP (Transmission8 Chapter 1 • Danger on the Internet ...