OBTAIN AN IP ADDRESS BY USING DHCPBEFORE YOU BEGIN THIS EXERCISE, YOU...

15-25Lesson 2 Configuring Dial-Up Connections

Allowing Incoming Dial-Up Connections

To configure and administer incoming connections on a computer running Windows

XP Professional, you use the New Connection Wizard (which was discussed in detail in

Lesson 1). On the Network Connection Type page (refer to Figure 15-7), click Set Up

An Advanced Connection, and then click Next. The New Connection Wizard displays

the Advanced Connection Options page (see Figure 15-14).

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Figure 15-14 Use the Advanced Connection Options page to set up an inbound connection.

On the Advanced Connection Options page, click Accept Incoming Connections, and

then click Next to display the Devices For Incoming Connection page.

Configuring Devices for Incoming Connections

The Devices For Incoming Connections page allows you to choose one of the available

devices on your computer to accept incoming calls. If the device you select is config-

urable, click Properties to configure it. For example, if you have selected a modem, the

possible options to configure in the device’s Properties dialog box include port speed,

error correction, use of compression, and the type flow control. The Advanced tab con-

tains additional configurable options, which might include the number of data bits, the

parity, the number of stop bits, and the modulation type.

Allowing VPN Connections

When you are finished configuring the device, click OK to close the Properties dialog box,

and then click Next in the Devices For Incoming Connection page (see Figure 15-15).

The New Connection Wizard displays the Incoming Virtual Private Network (VPN) Con-

nection page. If you click Allow Virtual Private Connections, Windows XP Professional

modifies Windows Firewall so that your computer can send and receive VPN traffic.

Select the option either to allow or not allow VPN connections, and then click Next.

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Figure 15-15 Configure the device that the incoming connection will use.

Specifying User Permissions and Callback Options

You must specify which users can use this inbound connection in the User Permissions

page. After you select a user, click Properties. In the user-name Properties dialog box,

click the Callback tab to set the callback options. You can choose Do Not Allow Call-

back, Allow The Caller To Set The Callback Number, or Always Use The Following

Callback Number. Enabling callback causes the remote server, in this case your com-

puter, to disconnect from the client calling in, and then to call the client computer

back. By using callback, you can have the bill for the phone call charged to the office

phone number rather than to the phone number of the user who called in. Callback

can also be used to increase security because if you specify the callback number you

do not have to worry about someone trying to break in. Even if an unauthorized user

calls in, the system calls back at the number you specified, not the number of the unau-

thorized user.

Selecting Networking Software

After you specify the callback options, click Next. The New Connection Wizard dis-

plays the Networking Software page. You can choose the networking software you

want to enable for incoming connections. You can also install additional networking

software by clicking Install. Click Finish to create the connection.