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.The phone number you use to dialis called an X.121 address.If you have an X.25 account, click the X.25 button on the Options tab to setit up.In the X.25 Logon Settings dialog box that opens, choose your service provider under Networkand enter the X.121 address to which you ll be dialing (see Figure 5-16).If appropriate for your account,you also can enter user data and facilities information.Figure 5-16: The X.25 Logon Settings dialog boxNetworking optionsThe Networking tab, shown in Figure 5-17, provides a world of options that apply to all your networkconnections.For Internet connections, the first option is the most important.The vast majority of Internetpage 86 Windows XP Bibleconnections support PPP connections, which is the option currently selected in the figure.The otheroption available from that drop-down list, SLIP: Unix Connection, isn t as widely used.If your ISPrequires SLIP, however, you need to select that option as opposed to the PPP option.Figure 5-17: The Networking tab of a dial-up account s Properties dialog boxWhen PPP is selected, the Settings button is available.Clicking that button presents the options shownin Figure 5-18.As obscure as the settings are, even these can prevent a successful Internet connection.If you re having any problems connecting to your ISP, you may want to disable those options to seewhether that helps.To get it right, however, you should really ask your ISP for the appropriate settings.Figure 5-18: The PPP settings dialog boxTCP/IP settingsAnother common cause of faulty Internet connections centers on TCP/IP (Transmission ControlProtocol/Internet Protocol) settings.To check, and possibly correct those, you need to click InternetProtocol (TCP/IP) as in Figure 5-19, and then click the Properties button.If your ISP gave you a specificIP address and/or DNS server addresses, you need to select the appropriate options and fill in thecorrect addresses.Figure 5-18 shows an example using some hypothetical addresses, just so you cansee what they might look like.page 87 Windows XP BibleFigure 5-19: The Internet Protocol (TCP/IP) Properties dialog boxEven more advanced TCP/IP options are available from the Advanced button.It s very unlikely that anISP would require that you tweak any of those more advanced options.They re really more for largecorporate networks with their own domain name servers, Dynamic Host Configuration Protocol (DHCP),LMHOSTS lookup, and so forth.If you re a corporate network administrator who needs access to suchadvanced settings, the Advanced button will take you to them.The Security and Advanced tabs of the connectoid s Properties dialog box provide options that, as arule, won t affect your ability to connect to your ISP.If you ve made any changes or corrections to any ofthe options discussed in this section, be sure to close all open dialog boxes by clicking their OK buttons.Then try connecting to your ISP through your connectoid again normally.Cross- Internet connection sharing is covered in Chapter 26.Internet securityReference and firewalls are discussed in Chapter 29.More Connection AutomationIf you want your computer to dial in to the Internet as soon as you open Microsoft Internet Explorer,follow these steps:1.Click the Start button and choose Control Panel.If Control Panel opens in Category view, clickNetwork and Internet Connections.2.Open the Internet Options icon.3.Click the Connections tab.4.If you have more than one connection defined, click the one that you ll use as the default andthen click the Set Default button (if it s available).5.Choose Always dial my default connection, as in Figure 5-20.page 88 Windows XP BibleFigure 5-20: Internet Explorer set up to connect automatically6.Click the OK button.From this point, you should be able to browse the Web at any time, just by opening your MicrosoftInternet Explorer program.More on browsing the Web in Chapter 6.SummaryTo connect to the Internet, you basically need two things: some type of modem and an account with anInternet service provider.This chapter has covered all the options and techniques required to getstarted.Here s a quick recap of the important points covered in this chapter:If you have an account with one of the large online services, such as AOL, CompuServe, MSN,or Prodigy, you already have Internet access.Go to that service and look for information aboutusing the Internet
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