Troubleshooting
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N300 WiFi Cable Modem Router Model C3000
Note: If the IP address of your computer is shown as 169.254.x.x:
Recent versions of Windows and Mac OS generate and assign an IP
address when the computer cannot reach a DHCP server. These
autogenerated addresses are in the range of 169.254.x.x. If your IP
address is in this range, check the connection from the computer to
the modem router and reboot your computer.
•If the IP address of your modem router has been changed and you do not know its
current IP address, clear the configuration of the modem router to its factory defaults.
This sets the IP address of the modem router to 192.168.0.1. For more information, see
Factory Default Settings on page 101.
•Make sure that your browser has Java, JavaScript, or ActiveX enabled. If you are using
Internet Explorer, click the Refresh button to make sure that the Java applet is loaded.
•Try quitting the browser and launching it again.
•Make sure that you are using the correct login information. The modem router user name
admin is lowercase (Caps Lock is off). The default password is password.
If the modem router does not save changes you have made, do the following:
•When entering configuration settings, be sure to click the Apply button before moving to
another screen, or your changes are lost.
•Click the Refresh or Reload button in the web browser. The changes have occurred, but
the web browser might be caching the old configuration.
Troubleshoot the ISP Connection
When your modem router cannot access the Internet and your Internet LED is on, register
the cable MAC address or device MAC address of your modem router with your cable service
provider.
Additionally, your computer might not have the modem router configured as its TCP/IP
gateway. If your computer obtains its information from the modem router by DHCP, reboot the
computer and verify the gateway address.
Troubleshoot a TCP/IP Network Using a Ping Utility
Most TCP/IP terminal devices and routers contain a ping utility that sends an echo request
packet to the designated device. The device then responds with an echo reply. You can
easily troubleshoot a TCP/IP network by using the ping utility in your computer or
workstation.