Anonymous web server - 190Part IIRunning the ShowChecking Your PPP ConnectionThe following
190Part IIRunning the ShowChecking Your PPP ConnectionThe following information will help you debug your PPP connection or simply bet- ter understand how it works. It is possible that your modem is not supported under Linux. If that is the case, your PPP connection might be failing because the modem was not detected at all. To scan your serial ports to see where your modem might be, type the following(asroot user): $ wvdialconf /etc/wvdial.conf.newThe wvdialconfcommand is really to build a configuration file (the /etc/wvdial. conffile) that is used by the dialer command (wvdial). (You only need this file ifyou use wvdialto do your dial-up.) Its first action, however, is to scan the serialports on your computer and report where it finds modems. If it tells you that nomodem was detected, it s likely that either your modem isn t connected properlyor no driver is available to support the modem. If the modem wasn t detected, you should determine whether it is a modem sup- ported in Linux. You can do this by finding out what type of chip set is used in themodem. This is even more important than finding out the manufacturer of themodem because the same manufacturer can use chips from different companies. (This applies primarily to internal modems because most external serial modemsand many USB modems are supported in Linux.) After you have determined the chip set being used, check the Linmodems.org Website (www.linmodems.org), which contains information on so-called Winmodemsthat have only recently begun to be supported in Linux. Search for the chip set onyour modem from this site. In many cases, the site tells you if there is a driver avail- able for your modem. SummaryMany different tools are available for configuring network connections in the variousLinux distributions. Fedora and other Red Hat Linux systems use a graphical NetworkConfiguration. SUSE Linux uses its YaST administrative interface to configure net- work equipment. For dial-up networks, the KDE desktop includes the KPPP GUI toolfor configuring modems. If your network connection doesn t start up automatically(as it does in many cases), this chapter explains how to use some of these networkconfiguration tools to configure it manually. By adding your computer to a public network, such as the Internet, you open it topossible intruders. The next chapter describes ways in which you can secure your11_