Dial-Up Networking

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Dial-Up Networking

This section steps through the configuration of the client computer and points out the important areas. The component that is used to connect to the RAS server is Dial-Up Networking. Before you can configure Dial-Up Networking, you must install a modem or other means of communications.

By using Dial-Up Networking, you will create a phonebook entry for each of the locations you will call. The steps that are required to create an entry are given in the following list.

1.	Open the My Computer icon and then open Dial-Up Networking. (If you do not have an entry, a wizard appears that will step you through creating a phonebook entry.)
2.	Click the New button to create an entry. You can also select an entry in the list and click More and choose Edit the Entry. If you choose New, the New Entry Wizard appears. You can choose to enter the information manually. Because this chapter is concerned with troubleshooting, this section covers the manual entries because they provide more options.
3.	The New (or Edit) Phonebook Entry dialog box appears (see Figure 17.15). By default, it opens to the Basic tab, the options for which are discussed below. Enter or verify the information.
	Entry name. The name of the entry. Comment. Any comment you want to make about the entry. Phone number. The phone number for the entry; you should verify this. You can enter multiple entries by selecting the Alternates button. These numbers are tried in the sequence in which they are entered; you also have the option to move the most successful number to the top of the list. Use telephony-dialing properties. This tells the system to use the properties that you set for your location when dialing the number. When you are troubleshooting, turn this off. Dial using. Informs the system which modem you want to use when dialing. Verify that the modem exists and, if Multilink is selected, choose configure and verify the phone numbers that are entered for each of the modems that are listed. Use another port if busy. This tells the system to dial using another modem if the modem specified is busy.
4.	Select the server tab and enter or verify the information (see Figure 17.16). The entries are described below.
	Dial-up server type. Tells the system what type of server you are trying to connect to. You can use three different types of servers: PPP, such as Windows NT, SLIP, and Windows NT 3.1 RAS. Make sure the correct type is selected or your computer will attempt to use the wrong line protocol. Network protocols. Here you can select the protocols that you want to be able to use. If the client computer will be using the Internet, TCP/IP needs to be selected. If the client is going to use the services of a remote NetWare server, IPX/SPX must be selected. If you will be using only the services from a Windows NT network, then you can choose any of the protocols (remembering that the server must also use this protocol.) Enable software compression. If you are working with a Windows NT server, you can select this to turn on the software compression. For troubleshooting purposes, you should turn this off. Enable PPP LCP extensions. Tells the system that the PPP server will be able to set up the client station and will be able to verify the user name and password. This also should be turned off when you are troubleshooting.
5.	If you are using TCP/IP for this connection, you should also set or verify the TCP/IP Settings. The TCP/IP setting screen will appear, the screen will be different depending on the type of server you selected. The PPP settings are shown in Figure 17.17 and a description of the options is given below.
	Server assigned IP address. Tells the computer that the server assigns the IP address for this station. The server must have some means of assigning IP addresses to use this option. Specify an IP address. Enables you to give the station an IP address. The address need to be unique and must be correct for the servers network. The server must also allow the client to request an IP address. Server assigned name server addresses. Tells the system that the server assigns the IP addresses for DNS and WINS server. Specify name server addresses. Lets you set the addresses for DNS and WINS servers. This option enables you to see whether the server is giving you correct addresses. Use IP header compression. The use of IP header compression reduces the overhead that is transmitted over the modem. Disable this when troubleshooting. Use default gateway on the remote network. If you are connected to a network and dialed in to a service provider, this option tells Windows NT to send information that is bound for a remote network to the gateway on the dial in server.
6.	Set the script options on the Script tab (see Figure 17.18).
	After dialing (login). There are three different settings here. Make sure you use the correct one. For NT-to-NT communications, select None. For other connections, you may have to enter information. For troubleshooting, try the terminal window, which lets you enter the information manually, rather than using the script. If this works, then you should verify the script. Before dialing. If you click this button, you are presented with basically the same options. You can use this to bring up a window or run a script before you dial the remote host.
7.	Check or enter the security information on the security tab (see Figure 17.19). This should be set to the same level as the security on the server or the connection will probably fail.
	Authentication and encryption policy. Here you can set the level of security that you want. For troubleshooting, you can try “Accept any authentication including clear text,” which should be set to match the setting on the server. Require data encryption. If you are using Microsoft-encrypted authentication, you will have the option to encrypt all data that is being sent over the connection. Set this to match the server. User current name and password. Enables Windows to send the current user name and password as your login information. If you are not using the same name and password on the client as you do on the network, do not check this box. You will be prompted for the user name and password to log on just like when you attempted to connect (see Figure 17.20). Unsave password. If you told the system to save the logon password for a connection, you can clear it by clicking on this button. You should do this in the case of a logon problem.
8.	Finally, you can enter or check the information for X.25 connections (see Figure 17.21).

Because there are so many different options to configure, there are great potential for errors. Client errors tend either to be validation problems or errors in the network protocols. Remember that you may need to check the configuration of the server.

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