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Common Networking Issues
Even though the number of dialup modem users is decreasing, they still make up a large percentage of home users and mobile users. When assisting those users, verify that the dialup account is still active. Because many ISPs provide a trial account, users frequently mistakenly try to use an expired account.If you are using a modem, double-check the PPP settings in Network preferences. The account password may be incorrect or the phone number may no longer be valid. If using a DSL or cable modem, try restarting the modem. Sometimes a cable or DSL modem will become unresponsive and the simplest method for resetting it is to turn the modem off, wait a few seconds, and then turn it on. This may also fix a known problem where some cable modems only recognize the first MAC address that is connected to their network port.NOTE
If you have a cable modem directly connected to your Macintosh, then add an AirPort Base Station to your home network, you would disconnect the Ethernet cable from your computer and attach it to the WAN port on the AirPort Base Station. In that situation, the cable modem may not recognize the AirPort Base Station (which has a different MAC address than your Macintosh). In this case, power cycle the cable modem, then connect it via Ethernet to the WAN port of your AirPort Base Station, configure the AirPort Base Station to authenticate with your cable ISP, and set your Macintosh to use the wireless connection.Lesson 10, "Providing Network Services."
