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308 Part IV: Using a Wireless Network We find sniffer programs to be handy because they’re a great way to take a quick survey of our surroundings when we’re on the road. For example, Pat was recently staying at a hotel that belonged to a chain partnered with Wayport, but Wayport hadn’t officially started offering service yet — and the hotel staff was clueless. No problem! A quick session using the Network Stumbler software (see the following subsection), and — lo and behold! — the Wayport access point in the lobby was up and running. With a quick flip of the wallet (to pull out his prepaid card), Pat was up and running on high-speed wireless Internet. Take that, dial-up! Network sniffer programs are also a good way to help you evaluate the security of your own network. In fact, they’re the main reason why the developers of Network Stumbler created the program. After you implement some of the security steps we discuss in Chapter 9, you can fire up your favorite sniffer program and see whether you’ve been successful. Netstumbler.com The granddaddy of wireless network sniffer programs is Network Stumbler (www.netstumbler.com), which is a Windows program (it works with Windows 95, 98, Me, 2000, and XP) that connects to the PC Card network adapter in your laptop and lets you survey the airwaves for available Wi-Fi access points. Network Stumbler lists all available access points and gives you relatively detailed information about things such as the SSID and Media Access Control (MAC) address of the AP, whether WEP is enabled, and the relative power of the signal. You can even combine Network Stumbler with a GPS card in your laptop to figure out exactly where you and the access point are located. Network Stumbler doesn’t work with every Wi-Fi card. You can find a list of compatible cards on the Netstumbler.com Web site. Figure 16-2 shows Network Stumbler in action in Pat’s house, tracking down his two access points (and one of his neighbor’s APs, too!). If you use a Pocket PC handheld computer, the folks at Netstumbler.com have a program for you: Mini Stumbler, available at the same Web site (www.netstumbler.com). A similar program called MacStumbler (www.macstumbler. com) is available for Mac OS X computers. In fact, a growing number of these network sniffer programs are available, and most of them are free to download. You can find a list at the Personal Telco Project at http://wiki.personaltelco.net/index.cgi/WirelessSniffer.
Figure 16-2: Netstumbling Pat’s house — lots of access there! Figure 16-3: Go! Go! Boingo! Boingo Chapter 16: Going Wireless Away from Home You can also use the Boingo client software (available at www.boingo.com) as a network sniffer program (as long as you’re using a compatible operating system and network adapter). The primary purpose of this software is to manage your connections to the Boingo network, but Boingo has also designed the software (and encourages the use of it) as a means of finding and connecting to freenets and other public open networks. You can even use the Boingo software as a manager for all your Wi-Fi network connections. If you have a wireless network at home, one or more in the office, plus some public networks you want to connect to, try out the Boingo software. Figure 16-3 shows the Boingo software in action. 309
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Wireless Home Networking FOR DUMmIE
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About the Authors Danny Briere foun
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