Netgear N450 N450 Cg3000dv2 Wifi Cable Model Router User Manual

							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 BehaviorAction
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. 
						

							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  
						

							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:
ping 192.168.0.1
3. Click the OK button.
You should see a message like this one:
Pinging  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 
where  is the IP address of a remote device such as your ISP’s DNS server. 
						

							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. 
						

							85
A
A.   Supplemental Information
This appendix includes the following sections:
•Factory Default Settings 
•Technical Specifications  
						

							 Supplemental Information
86 N450 WiFi Cable Modem Router Model N450/CG3000Dv2 
Factory Default Settings
You can return the modem router to its factory settings. On the rear panel of the modem 
router, press and hold the Reset button   for over seven seconds. The modem router 
resets and returns to the factory configuration settings shown in the following table.
Table 3.  Factory default settings 
FeatureParameterDefault
Modem Router 
loginUser login URL http://192.168.0.1
User name and password 
(case-sensitive)admin/password
Local network 
(LAN)LAN IP 192.168.0.1
Subnet mask 255.255.255.0
DHCP server Enabled
DHCP starting IP address 192.168.0.2
DHCP Ending IP address 192.168.0.254
Firewall Inbound communication from the 
InternetDisabled (except traffic on port 80, the HTTP port)
Outbound communication to the 
InternetEnabled (all)
Source MAC filtering Disabled
Internet 
connectionWAN MAC address Use default hardware address.
WAN MTU size 1500 
						

							 Supplemental Information
87  N450 WiFi Cable Modem Router Model N450/CG3000Dv2
Technical Specifications
The following table describes the technical specifications for the modem router.
Table 4.  Technical specifications
Wireless Wireless communication Enabled
SSID name Appears on the label of the modem router.
Security WPA/WPA2 
The default WPA/WPA2 password appears on the 
label of the modem router.
Broadcast SSID Enabled
Transmission speed Auto
1
Country/region United States (varies by region)
RF channel Auto
Operating mode n, g, and b
Data rate Best
Output power Full
Access point Enabled
Authentication type Open System
Wireless Card Access List All wireless stations allowed
1. Maximum wireless signal rate derived from IEEE Standard 802.11 specifications. Actual throughput varies. Network 
conditions and environmental factors, including volume of network traffic, building materials and construction, and 
network overhead, might lower actual data throughput rate.
ComponentSpecification
Network protocol and 
standards compatibilityData and routing protocols: TCP/IP, DHCP server, and client, DNS relay, NAT 
(many-to-one), TFTP client, VPN pass-through (IPSec, PPTP)
Power adapter• North America (input): 120V, 60 Hz, input
• All regions (output): 12 V DC @ 2.5A output 30W maximum
Physical specifications• Dimensions: 10.2 by 6.49 by 3.65 in. (259.17 by 164.77 by 92.72 mm)
• Weight: 1.30 lb (590 g)
Environmental• Operating temperature: 32 to 140F (0 to 40C)
• Operating humidity: 90% maximum relative humidity, noncondensing
• Electromagnetic emissions: Meets requirements of: FCC Part 15 Class B.
Table 3.  Factory default settings (continued)
FeatureParameterDefault 
						

							 Supplemental Information
88 N450 WiFi Cable Modem Router Model N450/CG3000Dv2 
Interface Local: 10BASE-T, 100/1000BASE-Tx, RJ-45
USB 2.0/1.1 function
802.11n/g/b
Internet: DOCSIS 3.0. Downward compatible with DOCSIS 2.0, 1.1, and 1.0
ComponentSpecification