When your computer connects to the Internet using the router, a number of devices have to work together.
Your computer connects to your router wirelessly using your PC Card or PCI Adapter.
Your router connects to your broadband cable modem or DSL modem using an Ethernet cable.
Your cable modem or DSL modem connects to your Internet Service Provider (ISP) using your cable or phone network.
The first step in solving this problem is to diagnose the cause. There are a number of places where the connection from your computer to the Internet might fail.
Check the indicator lights of your various devices. If one or more of these devices indicate a problem, it's a good indication of where you should focus your troubleshooting efforts.
Verify the wired or wireless connection to your router. If your computer cannot communicate with the router, it cannot access the Internet.
Verify that your router is working. Refer to your router's documentation for additional information.
If your router is working, verify that your router is connected connection to your Cable or DSL modem. Your router must be connected to your modem and communicating with it.
Verify your modem's connection to the Internet. Internet service through your Internet service provider must be available.
Use the USRobotics Ndx Configuration Utility to check the connection between your PC Card or PCI Adapter and your router.
Ensure that your computer is connected to your router rather than another router, such as a neighbor's router. You can use the USRobotics Ndx Configuration Utility to check the Network name (SSID) of the router that your PC Card or PCI Adapter is connected to. If it is connected to the wrong router, you can use the utility to force your PC Card or PCI Adapter to try to connect to your router. Refer to Connect to a Wireless Router or Access Point After Installation.
Ensure that your computer is close enough to your router to receive a signal and that there is nothing interfering with the signal, such as a microwave oven or a concrete wall. Check the Site Monitor tab of the USRobotics Ndx Configuration Utility. If your router is not listed, the problem may be signal strength.
Verify that your router is configured to broadcast its network name.
Ensure that the Ndx Configuration Utility is using the correct Network name (SSID) and wireless security settings for your router. Settings such as network name, security method (such as WPA or WEP), and security keys must all match.
Verify that the computer is allowed to connect to your router. If MAC filtering is enabled on your router, verify that the MAC address of your PC Card or PCI Adapter is allowed access to the router. You may need to add this MAC address to your router.
If your PC Card or PCI Adapter still cannot connect to your router, try a wired connection between your computer and your router. Connect an Ethernet cable between your computer's LAN port and a LAN port on your router. If a wired connection works, the problem is almost certainly with your computer's wireless connection to the router. Try the previous steps again.
If you can verify the connection between your computer and your router, it's likely the router is not connected to the Internet or is not functioning correctly. Refer to your router's documentation to troubleshoot your router's connection to the Cable or DSL modem and to verify your modem's connection to the Internet.
If your computer has a connection to your router and the Internet connection information on your router is configured correctly but you still cannot connect to the Internet, it is possible that the cable or DSL modem has lost its connection or is not functioning properly, or there's a problem with your ISP.
Ensure that an Ethernet cable is connected between your router's WAN port and the cable/DSL modem's Ethernet port and that the corresponding LEDs are lit.
Ensure that your cable/DSL modem is connected to your wall jack. (A cable modem uses a coax cable, and a DSL modem uses an RJ-11 cable.)
Restart your cable/DSL modem. (There may be a power switch or reset button on the modem or you may have to unplug/re-plug the modem's power adapter. Consult your modem's documentation.)
Reboot your router.
After the router reboots and the LEDs on the router have stabilized, if you still cannot access the Internet, please start at the beginning of this tutorial to determine if there is a new point of failure. It's possible that your wireless connection needs to be re-established.
If the router still does not have an IP address after repeating this tutorial, the problem may be with the cable/DSL modem or your ISP. Please contact your ISP's Customer Support.
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