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If, for some reason, you have been unable to set up your X Window System, you may have to set up such a network connection from the command line interface instead of a desktop. The following discussion shows how to make such a connection using wvdial. wvdial is the standard dialer used on Red Hat systems. For a dial-up PPP connection you can use the wvdial dialer, the same dialer used for the Red Hat PPP Dialer. wvdial is an intelligent dialer, which not only dials up an ISP service but also performs login operations, supplying your user name and password. wvdial first loads its configuration from the /etc/wvdial.conf file. In here, you can place modem and account information, including modem speed and serial device, as well as ISP phone number, user name, and password. The wvdial.conf file is organized into sections, beginning with a section label enclosed in brackets. A section holds variables for different parameters that are assigned values, such as username = chris. The default section holds default values inherited by other sections, so you needn't repeat them. Table 5-2 lists the wvdial variables. Table 5-2: wvdial Variables Description Explicitly inherit from the specified section. By default, sections inherit from the [Dialer Defaults] section. The device wvdial should use as your modem. The default is /dev/modem. The speed at which wvdial communicates with your modem. The default is 57,600 baud. Specifies the initialization strings to be used by your modem. wvdial can use up to 9. The default is "ATZ" for Init1. The phone number you want wvdial to dial. Specifies the area code, if any. Specifies any needed dialing prefix-for example, 70 to disable call waiting or 9 for an outside line. Specifies the dial operation. The default is "ATDT". Specifies the user name you use at your ISP. If your ISP has an unusual login prompt, you can specify it here. Specifies the password you use at your ISP. If your ISP has an unusual password prompt, you can specify it here. If pppd is installed on your Linux system somewhere other than /usr/sbin/pppd, you need to specify its location with this option. Specifies a static IP address to use (for ISPs that provide static IP addresses to users). For PAP or CHAP authentication, you may have to change this to your ISP's authentication name. The default value is *. Setting this option to No disables the carrier check by your
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Variable Inherits Modem Baud Init1 ... Init9 Phone Area Code Dial Prefix Dial Command Login Login Prompt Password Password Prompt PPPD PATH Force Address Remote Name Carrier Check
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Table 5-2: wvdial Variables Description modem. Used for a modem that reports its carrier line is always down.
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Stupid Mode
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In Stupid Mode, wvduak does not attempt to interpret any prompts from the terminal server and starts pppd after the modem connects. Enable this option for use with pppd version 2.3.0 or newer. Instructs pppd to look for a required file /etc/ppp/peers/wvdial. Specifies the default response for prompts that wvdial does not recognize. The default is ppp. If enabled, wvdial attempts to reestablish a connection automatically if you are randomly disconnected by the other side. This option is on by default.
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You can use the wvdialconf utility to create a default wvdial.conf file for you automatically. wvdialconf will detect your modem and set default values for basic features. You can then edit the wvdial.conf file and modify the Phone, Username, and Password entries with your ISP dial-up information. Remove the preceding ; to unquote the entry. Any line beginning with a ; is ignored as a comment.
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$ wvdialconf
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You can also create a named dialer, such as myisp in the following example. This is helpful if you have different ISPs you log into. The following example shows the /etc/wvdial.conf file: /etc/wvdial.conf
[Modem0] Modem = /dev/ttyS0 Baud = 57600 Init1 = ATZ SetVolume = 0 Dial Command = ATDT [Dialer Defaults] Modem = /dev/ttyS0 Baud = 57600 Init1 = ATZ SetVolume = 0 Dial Command = ATDT [Dialer myisp] Username = chris Password = mypassword Modem = /dev/ttyS0 Phone = 555-5555 Area Code = 555 Baud = 57600 Stupid mode = 0
To start wvdial, enter the command wvdial, which then reads the connection configuration information from the /etc/wvdial.conf file. wvdial then dials the ISP and initiates the PPP connection, providing your user name and password when requested.
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