Selecting an Internet Access Method in VB.NET

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Selecting an Internet Access Method
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When using unregistered IP addresses for your network clients, deciding whether to use a NAT router or a proxy server to provide Internet access for your users should be based on the amount of security you think your network needs. For average, nontech nical Internet users, a NAT router provides efficient access and is easy to install and configure. For power users who are more likely to abuse their Internet access, a proxy server might be preferable.
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Lesson 3
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Practice: Configuring a NAT Router
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In this practice, you configure the RRAS module on Server01 to function as a NAT router connecting the private network with an ISP s network. For this exercise, the Microsoft Loopback Adapter installed in the Server01 computer is presumed to be con nected to a WAN device providing a connection to the ISP. The other adapter is con nected to the local private network. Afterward, you disable the RRAS configuration to return the service to its original state.
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Exercise 1: Configuring Routing And Remote Access as a NAT router
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In this procedure, you use a predetermined configuration option supplied with RRAS to create a router that uses NAT and basic firewall techniques to protect the private network from intruders. 1. Log on to Server01 as Administrator. 2. Click Start, point to All Programs, point to Administrative Tools, and then click Routing And Remote Access. The Routing And Remote Access console appears, and SERVER01 (local) is listed in the console tree. 3. Click SERVER01 (local), and from the Action menu, select Configure And Enable Routing And Remote Access. The Routing And Remote Access Server Setup Wizard appears. 4. Click Next. The Configuration page appears. 5. Select the Network Address Translation (NAT). Allow Internal Clients To Connect To The Internet Using One Public IP Address option button, and then click Next. The NAT Internet Connection page appears. 6. With the Use This Public Interface To Connect To The Internet option button selected (as it is by default), select the WAN Connection interface. Note the Enable Security On The Selected Interface By Setting Up Basic Firewall. Basic Firewall Prevents Unauthorized Users From Gaining Access To This Server Through The Internet check box is also selected by default. Click Next. The Completing The Routing And Remote Access Server Setup Wizard page appears. 7. Click Finish. The Routing and Remote Access service starts and subheadings appear under SERVER01 (local). Note that the Internet Group Management Protocol (IGMP) has been installed, providing support for IP multicasting. 8. Click the NAT/Basic Firewall subheading.
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3
Planning Internet Connectivity
9. In the details pane, select the interface representing the network interface adapter connecting the computer to the private LAN (typically, the Local Area Connection interface), and from the Action menu, select Properties. The Properties dialog box for the interface appears. Note that the Private Interface Connected To Private Network option button is selected. 10. Click Cancel to close the Properties dialog box. 11. In the details pane, select the WAN Connection interface, and from the Action menu, select Properties. The Properties dialog box for the interface appears. Note that the Public Interface Connected To The Internet option button is selected by default, along with the Enable NAT On This Interface and Enable A Basic Firewall On This Interface check boxes. These features provide protection for the Internet connection interface by preventing access to the private network by unauthorized users. 12. Click Cancel to close the Properties dialog box. 13. Leave the Routing And Remote Access console open for the next exercise.
Exercise 2: Disabling Routing And Remote Access
In this procedure, you disable RRAS, removing the configuration you just created. This leaves RRAS in its original state so that you can create different configurations in later chapters. 1. Click SERVER01 (local), and from the Action menu, select Disable Routing And Remote Access. A Routing And Remote Access message box appears, warning that you are disabling the router. 2. Click Yes. The Routing and Remote Access service is stopped, and the subhead ings beneath the SERVER01 (local) icon disappear. 3. Close the Routing And Remote Access console.
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