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Page 76 / 90 Scroll up to view Page 71 - 75
Wireless Cable Modem Gateway CGD24G User Manual
6-2
Troubleshooting
v1.1, May 2009
Using LEDs to Troubleshoot
The following table provides help when using the LEDs for troubleshooting.
Table 6-1.
Using LEDs to Troubleshoot
LED Behavior
Action
All LEDS are off when the gateway
is plugged in.
Make sure that the power cord is properly connected to your gateway
and that the power supply adapter is properly connected to a
functioning power outlet.
Check that you are using the 12VDC power adapter supplied by
NETGEAR for this product.
If the error persists, you have a hardware problem and should contact
technical support.
All LEDs Stay On
•
Clear the gateway’s configuration to factory defaults. This will set the
gateway’s IP address to 192.168.0.1. See
“Backing Up and Restoring
Your Settings” on page 4-5
.
•
If the error persists, you might have a hardware problem and should
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
gateway and at the hub or PC.
•
Make sure that power is turned on to the connected hub or PC.
•
Be sure you are using the correct cable.
Cable Link LED is off and the
gateway is connected to the cable
television cable.
•
Make sure that the coaxial cable connections are secure at the
gateway and at the wall jack.
•
Make sure that your cable internet service has been provisioned by
your cable service provider. Your provider should verify that the signal
quality is good enough for cable modem service.
•
Remove any excessive splitters you may have on your cable line. It
may be necessary to run a “home run” back to the point where the
cable enters your home.
Page 77 / 90
Wireless Cable Modem Gateway CGD24G User Manual
Troubleshooting
6-3
v1.1, May 2009
Connecting to the Gateway’s Main Menu
If you are unable to access the gateway’s main menu from a computer on your local network,
check the following:
•
Check the Ethernet connection between the computer and the gateway as described in the
previous section.
•
Make sure that your PC’s IP address is on the same subnet as the gateway. If you are using the
recommended addressing scheme, your PC’s address should be in the range of 192.168.0.10 to
192.168.0.254. Refer to the link to the online document
“ITCP/IP Networking Basics” in
Appendix B
for help configuring your computer.
•
If your gateway’s IP address has been changed and you don’t know the current IP address,
clear the gateway’s configuration to factory defaults. This will set the gateway’s IP address to
192.168.0.1. This procedure is explained in
“Enabling Remote Management” on page 5-9
.
•
Make sure 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 you are using the correct login information. The gateway has two user names both
lower-case (
Caps Lock
should be off):
–
The superuser login name is
mso
with the default password of
changeme
.
–
The other login name is
admin
with the default password of
password
.
If the gateway 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 may have occurred, but
the Web browser may be caching the old configuration.
Note:
If your PC’s IP address is shown as 169.254.x.x:
Recent versions of Windows and MacOS will generate and assign an IP
address if the computer cannot reach a DHCP server. These auto-generated
addresses are in the range of 169.254.x.x. If your IP address is in this range,
check the connection from the PC to the gateway and reboot your PC.
Page 78 / 90
Wireless Cable Modem Gateway CGD24G User Manual
6-4
Troubleshooting
v1.1, May 2009
Troubleshooting the ISP Connection
If your gateway is unable to access the Internet and your Cable Link LED is on, you may need to
register the Cable MAC Address and/or Device MAC Address of you gateway with your cable
service provider. This is described in
“Connecting the Gateway” on page 1-5
.
Additionally, your PC may not have the gateway configured as its TCP/IP gateway. If your PC
obtains its information from the gateway by DHCP, reboot the PC and verify the gateway address.
See the link to the online document
“ITCP/IP Networking Basics” in Appendix B
.
Troubleshooting 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. Troubleshooting a TCP/IP
network is made easier by using the ping utility in your PC or workstation.
Testing the LAN Path to Your Gateway
You can use ping to verify that the LAN path to your gateway is set up correctly.
To ping the gateway from a PC running Windows 95 or later:
1.
From the Windows toolbar, click on the Start button and select Run.
2.
In the field provided, type Ping followed by the IP address of the gateway, as in this example:
3.
Click OK.
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
Page 79 / 90
Wireless Cable Modem Gateway CGD24G User Manual
Troubleshooting
6-5
v1.1, May 2009
If the path is not working correctly, you could have one of the following problems:
•
Wrong physical connections.
–
Make sure the LAN port LED is on. If the LED is off, see
“Using LEDs to
Troubleshoot” on page 6-2
.
–
Check that the corresponding Link LEDs are on for your network interface card and
for the hub ports (if any) that are connected to your workstation and gateway.
•
Wrong network configuration.
–
Verify that the Ethernet card driver software and TCP/IP software are both installed
and configured on your PC or workstation.
–
Verify that the IP address for your gateway and your workstation are correct and that
the addresses are on the same subnet.
Testing the Path from Your PC to a Remote Device
After verifying that the LAN path works correctly, test the path from your PC 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 your ISP’s DNS server.
If the path is functioning correctly, replies as in the previous section are displayed. If you do not
receive replies:
•
Check that your PC has the IP address of your gateway listed as the default gateway. If the IP
configuration of your PC is assigned by DHCP, this information will not be visible in your
PC’s Network Control Panel. Verify that the IP address of the gateway is listed as the default
gateway. See the link to the online document
“ITCP/IP Networking Basics” in Appendix B
.
•
Check to see that the network address of your PC (the portion of the IP address specified by
the netmask) is different from the network address of the remote device.
•
Check that your Cable Link LED is on.
•
If your ISP assigned a host name to your PC, enter that host name as the Account Name in the
Basic Settings menu.
Page 80 / 90
Wireless Cable Modem Gateway CGD24G User Manual
6-6
Troubleshooting
v1.1, May 2009

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