multilayered solution that requires common-sense evaluation and implementation. Obvious security fixes should be implemented first, such as limiting administrative access and disabling open access. WLAN security is closely tied to the volume of traffic that traverses the network. Therefore, the use of statistics to evaluate the relative vulnerability of the network is a valuable step toward assessing WLAN security. Attackers are more likely to target unsecured WLANs. Proper planning and implementation is required:
Content 6.4 Configuring Cisco WLAN Clients 6.4.1 Cisco 802.11a/b/g WLAN Client Adapters The Cisco 802.11a/b/g wireless client adapters are supported only by Windows 2000 and Windows XP. The Cisco Aironet 802.11a/b/g Wireless LAN Client Adapters (CB21AG and PI21AG) support IEEE 802.11a, IEEE 802.11b, and IEEE 802.11g (2.4 GHz and 5 GHz). The following describes the appearance of LED 0 and LED 1 for the CardBus and Peripheral Component Interconnect (PCI) cards: The installation wizard tool is in the file WinClient-802.11a-b-g-Ins-Wizard-v26.exe. Check cisco.com for later versions of this software. Installation requires a reboot at completion. This forced reboot can be suppressed by administrators who are installing other applications simultaneously; however, a reboot is strongly recommended at the end of the installations, and additional testing is also recommended. If a card is not inserted during initial installation, drivers are loaded in addition to utilities. After a card has been inserted, the rest of the installation takes place automatically.
Content 6.4 Configuring Cisco WLAN Clients 6.4.2 Cisco Aironet Desktop Utility Installation The setup utility allows you to install the driver, desktop utility, or both. Figure shows the step in the Cisco Aironet installation process where the option appears for installing the Site Survey Utility. The Site Survey Utility for the 802.11a/b/g card is an additional program that can be installed with the ADU. This new Cisco Aironet Site Survey Utility is available with ADU release 2.0.X and later. To install, make sure you select the Install Cisco Aironet Site Survey Utility checkbox. On Windows XP, you can configure your Cisco Aironet Wireless LAN Client Adapter through the Cisco ADU or a third-party tool, such as the Microsoft Wireless Configuration Manager. Because third-party tools may not provide all the functionality available in ADU, Cisco recommends that you use ADU. (Please note that a patch from Microsoft might be required to use the Microsoft tool with WPA security.) On the next screen, select whether you want to use ADU or a third-party tool to configure your client adapter. By enabling the third-party tool, you allow the client card to be controlled by another service, such as Windows XP Wireless Zero Config. Note: If you select a third-party tool, some of the ADU features are not available. To activate those features, you must re-install ADU. ADU works with AIR-CB21AG and AIR-PI21AG. Figure shows the main status screen of the ADU under the Current Status tab. This screen shows signal strength, association, IP address, and channel. For more details, click the Advanced button. The ADU main page does not list information about associated access points; however, selecting the Advanced button displays the Advanced Status tab, which provides that information. Current signal strength and noise level can be shown in either dBm or percent. You can change this setting from the Options menu. The Profile Management tab offers the following features: Figure shows how to create and modify profiles. The General tab includes the following settings: Figure shows how to configure and modify security in the profiles. WPA and WPA2 are supported as of version 2.0.x. Static WEP keys are selected as Pre-Shared Key (Static WEP). WPA/WPA2 Passphrase selects WPA/WPA2 Pre-shared Keys (PSK). Additional parameters for the selected security method have to be configured by clicking the Configure button. To increase connection speed, disable different wireless modes that are known to not be available. The maximum transmit power of the Cisco client adapter for IEEE 802.11a is 40 mW; for IEEE 802.11b/g, it is 100 mW.
Content 6.4 Configuring Cisco WLAN Clients 6.4.3 ADU Diagnostics: Advanced Statistics Under the Diagnostics Tab on the main screen of ADU, you can select Advanced Statistics to see detailed receive and transmit statistics of the adapter. This information is often used for troubleshooting. The Advanced Statistics dialog box shows the transmit and receive statistics and encryption errors. Under the Diagnostics tab on the main screen of ADU, you can select Adapter Information. The Adapter Information dialog box includes the following information: You can start the ADU troubleshooting utility from under the Diagnostics tab of the main screen or from the System Tray icon. This utility tests the card, driver, radio, association, and network connectivity. Click the Start Test button to execute the test. Click View Results to display the detailed results. The Aironet Monitor provides a System Tray icon, which allows you to open the ADU, disable and enable the radio, select profiles, and display the connection status and IP address. If security with authentication is configured in the active profile login, re-authentication can be initiated from the system tray icon.
Content 6.4 Configuring Cisco WLAN Clients 6.4.4 Cisco Aironet Site Survey Utility: Associated AP Status The Site Survey Utility monitors transmitted network traffic, and the link speed reflects the current transmit rate of data packets. The Associated AP Status tab includes the following information: