Operation Manual

Troubleshooting
125
N300 Wireless ADSL2+ Modem Router DGN2200v4
If the path is not working, you see this message:
Request timed out
If the path is not functioning correctly, you could have one of the following problems:
• Wrong physical connections
Make sure that the LAN port LED is lit. If the LED is off, follow the instructions in LAN
LED Is Off on page 120.
• Wrong network configuration
- Verify that the Ethernet card driver software and TCP/IP software are both
installed and configured on your computer or workstation.
- Verify that the IP address for your modem router and your workstation are correct
and that the addresses are on the same subnet.
Test the Path from Your Computer to a Remote Device
After you verify that the LAN path works correctly, test the path from your computer to a
remote device. In the Windows Run screen, type:
ping -n 10 IP address
where IP address is the IP address of a remote device such as your ISP’s DNS server.
If the path is functioning correctly, replies as described in Test the LAN Path to Your Modem
Router on page 124 display. If you do not receive replies:
• Check that your computer has the IP address of your modem router listed as the default
modem router. If the IP configuration of your computer is assigned by DHCP, this
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.
Changes Not Saved
If the modem router does not save the changes you make in the modem router interface,
check the following: