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Troubleshooting
66
WiFi Cable Modem Router C3700
Using LEDs to Troubleshoot
The following table provides help when using the LEDs for troubleshooting.
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 12V DC power adapter from NETGEAR
for this product.
If the error persists, you have a hardware problem. Contact technical
support.
All LEDs stay on.
•
Clear the configuration of the modem router to its factory defaults.
This operation sets the IP address of the modem router to
192.168.0.1. See
Factory Default Settings
on page
71.
•
If the error persists, you 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 Internet service has been provisioned by
your cable service provider. Your provider can verify that the signal
quality is good enough for gateway service.
•
Remove any excessive splitters that you have on your cable line.
Run a “home run” back to the point where the cable enters your
home.
Cannot Log In to the Modem Router
If you are unable to access the modem router from a computer on your local network, check
the following:
•
Check the Ethernet connection between the computer and the modem router as
described in the previous section.
•
Make sure that your IP address of your computer is on the same subnet as the modem
router. If you are using the recommended addressing scheme, the address of your
computer is in the range of 192.168.0.10 to 192.168.0.254.
Page 67 / 76
Troubleshooting
67
WiFi Cable Modem Router C3700
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 the
current IP address, clear the configuration of the modem router to its factory defaults.
This operation sets the IP address of the modem router to 192.168.0.1. This procedure is
explained in
Factory Default Settings
on page
71.
•
Make sure that your browser has Java, JavaScript, or ActiveX enabled. If you are using
Internet Explorer, click
Refresh
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
euskaltel
is lower-case (
Caps Lock
is off). The default password of
euskaltel
.
If the modem router does not save changes you have made, check 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 is unable to 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 does not have the modem router that is 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.
Page 68 / 76
Troubleshooting
68
WiFi Cable Modem Router C3700
Test the LAN Path to Your Gateway
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 PC running Windows 95 or later:
1.
From the Windows toolbar, click the
Start
button and select
Run
.
2.
In the field that is provided, type
ping
and then the IP address of the modem router, as in
this example:
3.
Click
OK
.
You 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.
-
Make sure that the LAN port LED is on. If the LED is off, see
Using LEDs to
Troubleshoot
on page
66.
-
Check the corresponding link LEDs are on for your network interface card and the
hub ports (if any) that are connected to your workstation and modem router.
•
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 verifying that the LAN path works correctly, test the path from your computer to a remote
device. From the Windows run menu, type:
ping -n 10
<IP address>
where <
IP address
> is the IP address of a remote device such as the DNS server of your ISP.
If the path is functioning correctly, replies as in the previous section are displayed. If you do
not receive replies:
•
Check that your computer has the IP address of your modem router is listed as the
default gateway. If the IP configuration of your computer is assigned by DHCP, this
Page 69 / 76
Troubleshooting
69
WiFi Cable Modem Router C3700
information is not visible in the Network Control Panel of your computer. Verify that the IP
address of the modem router is listed as the default gateway.
•
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 Internet LED is on.
•
If your ISP assigned a host name to your computer, enter that host name as the account
name in the Basic Settings screen.
Wireless Performance and Modem Router Location
The range of your wireless connection can vary based on the physical placement of the
modem router. The latency, data throughput performance, and notebook power consumption
of wireless adapters also vary depending on your configuration choices.
For best results, place your modem router according to the following guidelines:
•
Near the center of the area in which your computers operate.
•
In an elevated location such as a high shelf where the wirelessly connected
computers have line-of-sight access (even if through walls).
•
Away from sources of interference, such as computers, microwave ovens, and
2.4-GHz cordless phones.
•
Away from large metal surfaces.
•
To reduce interference when using more than one access point, NETGEAR
recommends using 5 channel spacing between adjacent access points (for example,
use Channels 1 and 6, or 6 and 11).
The time that it takes to establish a wireless connection can vary depending on both your
security settings and the modem router location. WEP connections can take slightly longer to
establish. Also, WEP encryption can consume more battery power on a notebook computer.
Page 70 / 76
70
A
A.
Supplemental Information
This appendix includes the following sections.
•
Factory Default Settings
•
Technical Specifications

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