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Authenticating Wireless Networks Using Windows Server 2008
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Windows wireless clients can authenticate using the following modes:
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Computer only Windows authenticates to the wireless network prior to displaying the
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Windows logon screen. Windows can then connect to Active Directory domain controllers and other network resources before the user logs on. No user authentication is required. User only Windows authenticates to the wireless network after the user logs on. Unless wireless Single Sign On is enabled (described later in this section), users cannot authenticate to the domain before connecting to the wireless network, however. Therefore, users can log on only if domain logon credentials have been cached locally. Additionally, domain logon operations (including processing Group Policy updates and logon scripts) will fail, resulting in Windows event log errors. Computer and user Windows authenticates prior to logon using computer credentials. After logon, Windows submits user credentials. In environments that use virtual LANs (VLANs), the computer s access to network resources can be limited until user credentials are provided (for example, the computer might be able to access only Active Directory domain controllers).
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Lesson 2: Configuring Wireless Networks
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Windows Vista and Windows Server 2008 support wireless Single Sign On, which allows administrators to configure user authentication to the wireless network to occur before the user logs on. This overcomes the weaknesses of user-only authentication. To enable wireless Single Sign On, use the Wireless Network (IEEE 802.11) Policies Group Policy extension or run the netsh wlan command with appropriate parameters.
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Configuring the RADIUS Server for Wireless Networks
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You can use a Windows Server 2008 computer to authenticate wireless users by configuring the Windows Server 2008 computer as a RADIUS server and configuring your wireless access points to send authentication requests to the RADIUS server. This architecture is shown in Figure 7-4.
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Wireless client
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Wireless access point Wireless credentials Wireless access point
Authentication requests
Wireless client
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RADIUS server
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Figure 7-4
Wireless authentication to a RADIUS server
First, add the Network Policy And Access Services role (if it is not yet installed) by following these steps. If the server role is already installed, you can simply add the Routing And Remote Access Services role service by right-clicking Network Policy And Access Services in Server Manager, and then choosing Add Role Services. 1. Click Start, and then choose Server Manager. 2. In the console tree, select Roles, and then in the details pane, click Add Roles. 3. If the Before You Begin page appears, click Next. 4. On the Select Server Roles page, select the Network Policy And Access Services check box, and then click Next.
7
Connecting to Networks
5. On the Network Policy And Access Services page, click Next. 6. On the Select Role Services page, select the Network Policy Server check box. Then, select the Routing And Remote Access Services check box. The Remote Access Service and Routing check boxes are automatically selected. Click Next. 7. On the Confirmation page, click Install. 8. After the Add Roles Wizard completes the installation, click Close. Next, configure the Network Policy Server to allow your wireless access point as a RADIUS client. 1. In Server Manager, select Roles\Network Policy And Access Services\NPS. If this node does not appear, close and reopen Server Manager. 2. In the details pane, under Standard Configuration, select RADIUS Server For 802.1X Wireless Or Wired Connections. Then, click Configure 802.1X. The Configure 802.1X Wizard appears. 3. On the Select 802.1X Connections Type page, select Secure Wireless Connections, and then click Next. 4. On the Specify 802.1X Switches page, you will configure your wireless access points as valid RADIUS clients. Follow these steps for each wireless access point, and then click Next: a. Click Add. b. In the New RADIUS Client dialog box, in the Friendly Name box, type a name that identifies that specific wireless access point. c. In the Address box, type the host name or IP address that identifies the wireless access point. d. In the Shared Secret section, select Manual and type a shared secret. Alternatively, you can automatically create a complex secret by selecting the Generate option button and then clicking the Generate button that appears. Also, write the shared secret down for later use. e. Click OK. 5. On the Configure An Authentication Method page, from the Type drop-down list, select one of the following authentication methods, and then click Next: Microsoft: Protected EAP (PEAP) This authentication method requires you to install a computer certificate on the RADIUS server and a computer certificate or user certificate on all wireless client computers. All client computers must trust the certification authority (CA) that issued the computer certificate installed on the RADIUS server, and the RADIUS server must trust the CA that issued the certificates that the client computers provide. The best way to do this is to use an enter-
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