Linux Networking Clearly Explained - lions-wing.net

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CHAPTER 1 • CREATING A DIAL-UP INTERNET CONNECTION 19 Choosing Device Settings Figure 1.3 Set up the serial connection in this dialog box. If KPPP is not already open, click on the Main Menu button, point to Internet and then click KPPP. In the KPPP dialog box, click Setup. Now you are ready to configure this powerful tool. In the PPP Configuration dialog box, click the Device tab. You will see the Device settings, shown in Figure 1.3. You may have already used this tab earlier in this chapter to set the proper COM port. Now review the other options shown in Figure 1.3: • Flow Control. Regulates the speed of data, so that the data are not lost between your modem and your computer. There are two basic types of flow control, hardware (CRTSCTS) and software (XON/XOFF). As most software modems do not work with Linux, this should normally be set to CRTSCTS.
20 PART ONE • CONNECTING TO THE INTERNET Configuring Modem Setting • Line Termination. This setting is important only for text based modem communication, which you probably will not use (PPP is automatic and does not require any text-based interaction). Note, though, that you may not be able to see your commands or the answers from the remote computer if you choose the wrong setting here. The most common standard is Carriage Return/Line Feed (CR/LF). Because modems are set up differently, you may need to change this setting when you are using text based commands. Some trial and error may be necessary. • Connection Speed. This is not the speed of your modem. This is the speed between your COM port and your modem, in bits per second. The typical maximum speed for most computer COM ports is 115,200 bps. If you have trouble logging on to an Internet account, you could try a slower connection speed. • Use Lock File. This should be checked, to ensure that no other program tries to communicate with your modem while you are connected to the Internet. • Modem Timeout. If your modem does not connect after dialing due to a busy signal or line fault, KPPP will redial the number automatically. You should specify a timeout setting so that the modem can hang up and the system can provide a dial tone again. Typical modem timeouts are 30-60 s. In the KPPP Configuration dialog box, click the Modem tab. You may already have used the “Query Modem” command to test your modem. The other commands in this dialog box include:
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Page 6 and 7: Contents Part I Connecting to the I
Page 8 and 9: CONTENTS vii Looking Under the Hood
Page 10 and 11: CONTENTS ix Repeating the Full Back
Page 12 and 13: Part One Connecting to the Internet
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70 PART TWO • BUILDING YOUR LOCAL
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100 PART TWO • BUILDING YOUR LOCA
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228 PART THREE • CONNECTING YOUR
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286 PART FOUR • CREATING AN INTRA
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314 PART FIVE • MANAGING YOUR NET
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384 INDEX Apache Web server(s) (con
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386 INDEX ftpgroups, 305 ftphosts,
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388 INDEX Network File System (NFS)
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390 INDEX transceiver, 99 Transmiss
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