Owner's Manual

Troubleshooting
146
N600 Wireless Dual Band Gigabit VDSL2 Modem Router DGND3800B
information is not visible in your computer’s Network Control Panel. Verify that the IP
address of the modem router is listed as the default router.
• Check that the network address of your computer (the portion of the IP address specified
by the netmask) is different from the network address of the remote device.
• Check that your cable or DSL modem is connected and functioning.
• If your ISP assigned a host name to your computer, enter that host name as the account
name in the Internet Setup screen.
• Your ISP could be rejecting the Ethernet MAC addresses of all but one of your computers.
Many broadband ISPs restrict access by allowing traffic only from the MAC address of
your modem, but some additionally restrict access to the MAC address of a single
computer connected to that modem. In this case, configure your modem router to clone or
spoof the MAC address from the authorized computer.
Cannot Log In
If you cannot log in to the modem router from a computer on your local network, check the
following:
• The router is plugged in and it is on.
• You are using the correct login information. The login name is admin, and the password
is password. Make sure that Caps Lock is off when you enter this information.
• If you cannot connect wirelessly, try an Ethernet connection and view the router wireless
settings and set up your wireless computer with corresponding wireless settings.
• If you are using an Ethernet-connected computer, check the Ethernet connection
between the computer and the router. The LAN LED for the port you are using on the
router should light up to show your connection.
• Your computer’s IP address is on the same subnet as the router. If you are using the
recommended addressing scheme, your computer’s address should be in the range
192.168.0.2 to 192.168.0.254.
• If the computer IP address is 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. The
autogenerated addresses are in the range 169.254.x.x. If your IP address is in this range,
check the connection from the computer to the router and reboot your computer.
• If your router’s IP address was changed and you do not know the current IP address,
clear the router’s configuration to factory defaults. For more information, see
Factory
Settings on page 149. This sets the router’s IP address to 192.168.0.1.
• Make sure that your browser has Java, JavaScript, or ActiveX enabled. If you are using
Internet Explorer, click Refresh to be sure that the Java applet is loaded.
• Try closing the browser and relaunching it.