Windows Vista Security: Praxisorientierte Sicherheit für Profis

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Chapter 17: Mastering Dial-Up, Broadband, and On-the-Go Networking

To use a dial-up connection for a VPN connection, follow these steps:

1. Click “Dial directly” to use your modem to make the VPN connection.

2. On the “Type the telephone number” page, enter the phone number provided by

your network administrator.

3. Complete steps 4–10 of the previous procedure. After providing the necessary

information, click Create to create the dial-up VPN connection.

Configuring Proxy Settings for Mobile Connections

Many organizations today use proxies to protect their users from intrusion and to

use smaller amounts of publicly routed IP addresses. A proxy is a server that sits

between you and the Internet. It receives all client requests to the Internet, fulfills the

request itself, and then sends the information to the client. When creating network

connections, you may need to configure a proxy in order to gain access to the Inter-

net or other external servers.

Windows Vista offers support for adding proxies inside Internet Explorer’s settings.

You can configure the proxy server and port to support the different protocols you

use for accessing services that require a proxy within your organization.

You can enable or disable proxy settings on a per-connection basis as well as for the

LAN. You should enable proxy settings only when using a proxy is required. If you

enable proxy settings and a proxy is not required, you won’t be able to use the

related connection to access the Internet or resources on your network. This hap-

pens because your computer will look for a proxy that isn’t there. Malware pro-

grams sometimes target your proxy settings, and you may have to enable or disable

these settings as a result.

You can configure a proxy for a LAN connection by completing these steps:

1. Click Start, and then click Internet Explorer.

2. Click Tools from the menu bar, and then click Internet Options.

3. In the Internet Options dialog box, click the Connections tab.

4. Click the LAN Settings button listed under the Local Area Network (LAN) Set-

tings heading.

5. To enable the use of a proxy server, check the box for “Use a proxy server for

your LAN (These settings will not apply to dial-up or VPN connections),” as

shown in Figure 17-16.

6. Enter the IP address of the proxy in the Address text box.

7. Enter the port number of the proxy in the Port text box.

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8. If you want to bypass the proxy server for local IP addresses, select the “Bypass

proxy server for local addresses” checkbox.

9. Click OK to complete the proxy configuration process.

You can configure a proxy for a dial-up or VPN connection by completing these steps:

1. Click Start, and then click Internet Explorer.

2. Click Tools from the menu bar, and then click Internet Options.

3. In the Internet Options dialog box, click the Connections tab.

4. Under Dial-up and Virtual Private Network Settings, click the connection you

want to work with and then click Settings.

5. In the Connection Settings dialog box, enable the use of a proxy server by check-

ing the box for “Use a proxy server for your LAN (These settings will not apply

to dial-up or VPN connections).”

6. Enter the IP address of the proxy in the Address text box.

7. Enter the port number of the proxy in the Port text box.

8. Click OK to complete the proxy configuration process.

Whenever you change network connection settings, you should verify that you can

establish a connection and access resources. If you are having difficulty connecting to

the Internet after changing your connection settings, check your proxy settings in

Internet Explorer to enable or disable your proxy configuration as appropriate for

each connection.

Figure 17-16. Configuring LAN proxy settings as necessary