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Page 81 / 88 Scroll up to view Page 76 - 80
Troubleshooting
81
N450 WiFi Cable Modem Router Model N450/CG3000Dv2
Basic Functions
After you have turned on power to the modem router, do the following:
1.
Check to see that the Power LED is lit.
2.
Check that the numbered Ethernet LEDs light momentarily.
3.
After a few seconds, check that the LEDs are lit for any local ports that are connected.
The following table provides help when you are using the LEDs for troubleshooting.
Table 2.
LED behavior
Connect to the Modem Router’s Main Menu
If you are unable to access the modem router’s main menu from a computer on your local
network, check the following:
•
Check the Ethernet connection between the computer and the modem router as
described in
Basic Functions
on page
81.
LED Behavior
Action
All LEDs are off when the modem
router is plugged in.
•
Make sure that the power cord is properly connected to your
modem router and that the power supply adapter is properly
connected to a functioning power outlet.
•
Check that you are using the 12 V DC power adapter supplied by
NETGEAR for this product.
If the error persists, you have a hardware problem. Contact technical
support.
All LEDs stay on.
Clear the modem router’s configuration to factory defaults. This sets
the modem router’s IP address to 192.168.0.1. See
Factory Default
Settings
on page
86.
If the error persists, you might have a hardware problem. Contact
technical support.
LAN LED is off for a port with an
Ethernet connection.
•
Make sure that the Ethernet cable connections are secure at the
modem router and at the hub or computer.
•
Make sure that power is turned on to the connected hub or
computer.
•
Be sure that you are using the correct cable.
Internet LED is off and the modem
router is connected to the cable
television cable.
•
Make sure that the coaxial cable connections are secure at the
modem router and at the wall jack.
•
Make sure that your cable service provider provisioned your cable
Internet service. Your provider should verify that the signal quality
is good enough for cable modem service.
•
Remove any excessive splitters you might have on your cable line.
It might be necessary to run a “home run” back to the point where
the cable enters your home.
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Troubleshooting
82
N450 WiFi Cable Modem Router Model N450/CG3000Dv2
•
Make sure that your computer’s IP address is on the same subnet as the modem router.
If you are using the recommended addressing scheme, your computer’s address is in the
range of 192.168.0.10 to 192.168.0.254.
Note:
If your computer’s IP address is shown as 169.254.x.x:
Recent versions of Windows and Mac OS generate and assign an IP
address if 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 your modem router’s IP address has been changed and you do not know the current IP
address, clear the modem router’s configuration to factory defaults. This sets the modem
router’s IP address to 192.168.0.1. For more information, see
Factory Default Settings
on
page
86.
•
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
is
admin,
and
the default password is
password
, both in lower case letters. (Caps Lock
should be off when you enter these.)
If the modem router does not save changes you have made, try 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 might have
occurred, but the web browser might be caching the old configuration.
Troubleshoot the ISP Connection
If your modem router is unable to access the Internet and your Internet LED is lit, you might
need to 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
modem router. If your computer obtains its information from the modem router by DHCP,
reboot the computer and verify the modem router address. For more information, see
Reserve an IP Address for DHCP Use
on page
69.
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
Page 83 / 88
Troubleshooting
83
N450 WiFi Cable Modem Router Model N450/CG3000Dv2
easily troubleshoot a TCP/IP network by using the ping utility in your computer or
workstation.
Test the LAN Path to Your Modem Router
You can use ping to verify that the LAN path to your modem router is set up correctly.
To ping the modem router from a computer running Windows 95 or later:
1.
From the Windows toolbar, click the
Start
button and select
Run
.
2.
In the field provided, type
ping
followed by the IP address of the modem router, as in this
example:
3.
Click the
OK
button.
You should see a message like this one:
Pinging <IP address> with 32 bytes of data
If the path is working, you see this message:
Reply from < IP address >: bytes=32 time=NN ms TTL=xxx
If the path is not working, you see this message:
Request timed out
If the path is not working correctly, you could have one of the following problems:
•
Wrong physical connections. Check the following:
-
Make sure that the LAN port LED is lit. If the LED is off, see
Basic Functions
on
page
81.
-
Check that the corresponding LEDs are lit for your network interface card and for
the hub ports (if any) that are connected to your workstation and modem router.
•
Wrong network configuration. Check the following:
-
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 verifying that the LAN path works correctly, test the path from your computer to a
remote device. From the Windows Run dialog box, type:
ping -n 10
<IP address>
where <
IP address
> is the IP address of a remote device such as your ISP’s DNS server.
Page 84 / 88
Troubleshooting
84
N450 WiFi Cable Modem Router Model N450/CG3000Dv2
If the path is functioning correctly, replies as in the previous section are displayed. If you do
not receive replies, do the following:
•
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 modem router.
•
Check to see 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 Internet LED is lit.
Page 85 / 88
85
A
A.
Supplemental Information
This appendix includes the following sections:
•
Factory Default Settings
•
Technical Specifications

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