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19. Return to Computer2 and click the General tab in the MyVPN Properties dialog
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20. In the Host Name Or IP Address Of Destination text box, type the public IP
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address currently assigned to Computer1.
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21. Click the Networking tab.
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22. In the Type Of VPN drop-down list box, select L2TP IPSec VPN.
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23. Click OK.
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24. From Computer2, log off Domain1.
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25. Perform the next exercise before the MyISP connection disconnects on
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Computer1.
Exercise 5 (Optional): Testing the L2TP/IPSec Configuration
In this exercise, you test the connectivity of the new VPN. 1. From Computer2, log on to Domain1 as User1 through the MyVPN connection.
Follow the same steps listed in Exercise 3, Logging on to a Domain Through a
VPN Connection.
2. Once the VPN connection is established, switch to Computer1.
3. On Computer1, open the Routing And Remote Access console.
4. In the console tree, click the Ports node.
Lesson 3
Implementing VPNs 10-67
In the details pane, you can now see that only one L2TP port has an active status. Notice that by default, only five PPTP ports, one PPP over Ethernet (PPPoE) port, and five L2TP ports are available. Thus, unless more ports are added, only these numbers of corresponding connections can be accepted by the server at once. 5. In the console tree, right-click the Ports node, and then click Properties. The Ports Properties dialog box opens. 6. In the list of devices, select WAN Miniport (L2TP), and then click the Configure button. The Configure Device WAN Miniport (L2TP) dialog box opens.
Note
The Demand-Dial Routing Connections check box is cleared by default. When enabled, this option allows this port to be used for demand-dial routing through VPNs.
7. In the Maximum Ports text box, type 1500. 8. Click OK. A message box appears, indicating that the number of ports must be between 0 and 1000. In other words, you can configure the Routing And Remote Access ser vice to accept up to 1000 simultaneous L2TP connections. In the same way, you can configure up to 1000 PPTP ports. 9. Click OK. 10. In the Configure Device WAN Miniport (L2TP) dialog box, click Cancel. 11. In the Ports Properties dialog box, click Cancel. 12. Log off Computer1 and Computer2.
Lesson Review
The following questions are intended to reinforce key information presented in this lesson. If you are unable to answer a question, review the lesson materials and try the question again. You can find answers to the questions in the Questions and Answers section at the end of this chapter. 1. What is the difference between the certificates used for the EAP-TLS authentication protocol and those used for the L2TP/IPSec VPN protocol
10-68
10
Configuring and Managing Remote Access
2. You have configured a VPN server, but users report that they sometimes cannot connect. You have noticed that the greatest number of complaints occur when network use is highest, and you have ruled out addressing as the cause. What is the most likely reason for the intermittent access problems
3. Why are pre-shared keys in IPSec not considered secure
Lesson Summary
Virtual private networks are networks that logically emulate a local network but that physically span the Internet. In a remote access VPN scenario using Windows Server 2003, a single user con nects across the Internet to a Windows Server 2003 computer running Routing And Remote Access. In an extranet scenario, private LANs are joined across the Internet by two Windows Server 2003 computers running Routing And Remote Access. In general, PPTP-type VPN tunnels are easier to implement but less secure than those of the certificate-based L2TP/IPSec type. For PPTP connections, MPPE pro vides encryption. L2TP/IPSec connections, unlike those of PPTP, require computer authentication in addition to user authentication. When computer authentication is provided by the use of a certificate infrastructure, L2TP-type VPN connections are considered very secure. When computer authentication is provided by the use of preshared keys, L2TP-type VPN connections are not considered secure.
Lesson 4
Deploying the Internet Authentication Service 10-69
Lesson 4: Deploying the Internet Authentication Service
IAS is the Microsoft implementation of a RADIUS server and proxy. As a RADIUS server, IAS performs centralized connection authentication, authorization, and account ing for many types of network access, including wireless, authenticating switch, dial-up and VPN remote access, and router-to-router connections. As a RADIUS proxy, IAS forwards authentication and accounting messages to other RADIUS servers.
After this lesson, you will be able to
Configure IAS to provide authentication for Routing And Remote Access clients
Estimated lesson time: 45 minutes
Exploring RADIUS Server Scenarios
The basic purpose of a RADIUS server is to centralize remote access authentication, autho rization, and logging. RADIUS is useful, for example, in large organizations such as ISPs that need to manage many remote access connections to separate remote access servers. Figure 10-40 illustrates such a scenario, in which dial-up users connect to an ISP in four different cities. The network access servers, running Routing And Remote Access, forward remote access requests to a RADIUS server by means of the RADIUS protocol. The RADIUS server then communicates with the domain controller for user authentica tion. After user authentication, remote access policies defined on the RADIUS server are applied to the connection. If the remote access connection is authorized, the RADIUS server communicates with the network access server to allow network access. If not, network access is denied.
10-70
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