Netgear N 750 User Manual

							Troubleshooting27
Make sure that the network settings of the computer are correct: 
1.
Verify that your LAN-connected computers are configured to obtain an IP address 
automatically through DHCP. For help with this, see the documentation for your computer or 
“Related Documents” on page 39.
2.Verify whether the MAC address is needed. Some cable modem services require you to use 
the MAC address of the computer registered on the account. If this is the case, in the Router 
MAC Address section of the Basic Settings screen, select Use this Computer’s MAC 
Address. To save your settings, click Apply. Restart the network in the correct sequence.
Check the router status lights to verify correct router operation:
If the Power light does not turn solid green within 2 minutes after you turn the router on, reset the 
router according to the instructions in “Restoring the Default Password and Configuration 
Settings” on page 38.
Checking Basic Router Functions
After you turn on power to the router, check that the following sequence of events has occurred:
1. When power is first applied, verify that the Power light is on and that it is solid amber while 
the router boots up (see “Front Panel” on page 3 for an illustration).
2. Verify that the Power light turns amber within a few seconds, indicating that the self-test 
procedure is running.
3. After approximately 90 seconds, verify that:
a.The color of the Power light changes to green.
b.The LAN port lights are lit for any local ports that are connected.
If a port’s light is lit, a link has been established to the connected device. If a LAN port is 
connected to a 1 Gbps device, verify that the port’s light is green. If the port is 10/100 
Mbps, the light will be amber.
c.The Internet port is connected and its light is lit.
4. Verify that the WPS button light on the front panel is blinking when you push it. 
						

							Troubleshooting28
If the correct behavior does not occur, check for a remedy from the following table.
Table 3.  Troubleshooting the router’s LED behavior 
LED BehaviorRecommended Action
Power light is off. See “Connecting Your N750 Wireless Gigabit Router” on page 11), check the 
following:
• Make sure that the power cord is properly connected to your router and that 
the power adapter is properly connected to a functioning power outlet.
• Check that you are using the power adapter supplied by NETGEAR for this 
product.
If the error persists, you have a hardware problem and should contact technical 
support.
Power light stays amber. When the router is turned on, the Power light turns amber for about 90 seconds 
and then turns green. If the light does not turn green, the router has a problem.
If the Power light is still amber 2 minutes after turning on power to the router:
1. Turn the power off and back on to see if the router recovers.
2. Clear the router’s configuration to factory defaults. This will set the router’s 
IP address to 192.168.1.1. This procedure is explained in “Restoring the 
Default Password and Configuration Settings” on page 38.
If the error persists, you might have a hardware problem and should contact 
technical support.
Power light blinks green 
continuously.The router firmware is corrupted.
To restore your firmware:
1. Make sure that your PC is connected to your router and the router is 
powered on.
2. Insert the Resource CD that came with your router into your PC.
The CD automatically starts and detects the language you are using on your 
PC. Select a different language option, if you prefer. If the CD does not 
automatically start, browse the CD and double-click on .
3. Click Supporting Software, then Netgear Firmware Recovery Utility, and 
follow the 
prompts for the recovery process.
4. After firmware recovery is complete, follow the prompts to restore your 
configuration 
						

							Troubleshooting29
For more information on WPS functionality and advanced features, see the online Reference 
Manual.
Troubleshooting Login Problems
If you are unable to log in to the N750 wireless gigabit router, check the following:
• If you are using an Ethernet-connected computer, check the Ethernet connection between the 
computer and the router as described in the previous section.
• Make sure that you are using the correct login information. The factory default login name is 
admin, and the password is password. Make sure that Caps Lock is off when you enter this 
information.
• Typically, your computer’s address should be in the range of 192.168.1.2 to 192.168.1.254. 
Refer to your computer’s documentation for help with finding your computer’s IP address. 
Internet light stays 
amber.When the router is turned on, the Internet light turns amber for about 70 seconds 
and then turns green. If the light does not turn green, the router has a problem.
If the Internet light is still amber 2 minutes after turning on power to the router:
1. The Internet is not accessible. Confirm that you have the correct internet 
setting. 
2. Clear the router’s configuration to factory defaults. This will set the router’s 
IP address to 192.168.1.1. This procedure is explained in “Restoring the 
Default Password and Configuration Settings” on page 38.
3. Turn the power off and back on to see if the router recovers.
Internet or LAN port lights 
are off.If either the LAN or Internet lights do not light when the Ethernet connection is 
made, check the following:
1. Make sure that the Ethernet cable connections are secure at the router and 
at the computer.
2. Make sure that power is turned on to the connected computer.
3. Be sure you are using Ethernet cables like the cable that was supplied with 
the N750 wireless gigabit router.
See “Connecting Your N750 Wireless Gigabit Router” on page 11 for 
instructions.
If your computer’s IP address is 169.254.x.x, verify that you have a good 
connection from the computer to the router, and then restart your computer.
Table 3.  Troubleshooting the router’s LED behavior (continued) 
						

							Troubleshooting30
• Make sure that your browser has Java, JavaScript, or ActiveX enabled. If you are using 
Internet Explorer, click Refresh to be sure that the Java applet is loaded. Try closing the 
browser and starting it again.
Checking the Internet Service Connection
If your router is unable to access the Internet, check that the Internet connection is working, and 
then check that the N750 wireless gigabit router can get an Internet address. 
Check that the Internet connection is working:
1.Internet connection. First verify that your cable or ADSL modem has a successful 
connection. The cable or ADSL modem status lights indicate if the modem connection is 
successful or not. Check your modem documentation, or call your Internet Service Provider 
for help with verifying that the modem has a successful connection. 
2.Wireless router Internet light is green. If your Internet light is solid green, then you have a 
good Internet connection, and your wiring is correct.
3.Wireless router Internet light is solid amber. If your Internet light is solid amber, then your 
N750 wireless gigabit router is attempting to make an Internet connection with the service 
provider. The light should turn green within several minutes. If it does not, check the Internet 
connection on the modem.
4.Wireless router Internet light off. If the Internet light is off, verify that the Ethernet cable is 
securely connected between the cable or ADSL modem, and that both the modem and N750 
wireless gigabit router are turned on. 
Obtaining an Internet IP Address
If your N750 wireless gigabit router is unable to access the Internet, and your Internet light is 
amber, check the N750 wireless gigabit router to see if it is able to get an Internet IP address from 
your service provider. Unless you have a static IP address, your N750 wireless gigabit router 
automatically requests an IP address from your service provider. 
To check the Internet IP address from the browser interface: 
1.
Log in to the N750 wireless gigabit router.
2.Select Router Status under Maintenance on the main menu to check that an IP address is 
shown for the Internet port. If 0.0.0.0 is shown, your N750 wireless gigabit router has not 
obtained an IP address from your service provider. 
						

							Troubleshooting31
If your router is unable to obtain an IP address from the your service provider, the problem might 
be one of the following:
• Your service provider might require a login. Ask your service provider whether they require 
PPP over Ethernet (PPPoE) login.
• The service name, user name, and password might be set incorrectly. See “Troubleshooting 
PPPoE”.
• Your service provider might check for your computer’s host name.
Assign the computer host name of your ISP account to the N750 wireless gigabit router in the 
Basic Settings screen.
• Your service provider allows only one Ethernet MAC address to connect to Internet, and 
might check for your computer’s MAC address. In this case, do one of the following:
– Inform your service provider that you have bought a new network device, and ask them to 
use the N750 wireless gigabit router’s MAC address.
– Configure your router to spoof your computer’s MAC address. This can be done in the 
Basic Settings screen. Refer to the online help, which you can access from the N750 
wireless gigabit router main menu.
Troubleshooting PPPoE 
To troubleshoot a PPPoE connection:
1.
Log in to the N750 wireless gigabit router.
2.Select Router Status under Maintenance on the main menu.
3.Click the Connection Status button.
4.If all the steps indicate OK, then your PPPoE connection is up and working.
5.If any of the steps indicate Failed, you can attempt to reconnect by clicking Connect. The 
N750 wireless gigabit router will continue to attempt to connect indefinitely.
If you cannot connect after several minutes, you might be using an incorrect service name, 
user name, or password. There also might be a provisioning problem with your ISP.
Unless you connect manually, the N750 wireless gigabit router will not 
authenticate using PPPoE until data is transmitted to the network. 
						

							Troubleshooting32
Troubleshooting Internet Browsing
If your N750 wireless gigabit router can obtain an IP address but your computer is unable to load 
any Web pages from the Internet, check the following.
• Your computer might not recognize any DNS server addresses. 
A DNS server is a host on the Internet that translates Internet names (such as www addresses) 
to numeric IP addresses. Typically your ISP provides the addresses of one or two DNS servers 
for your use. If you entered a DNS address when you configured the N750 wireless gigabit 
router, restart your computer. Alternatively, you can configure your computer manually with 
DNS addresses, as explained in the documentation for your computer.
• Your computer might not have the N750 wireless gigabit router configured as its default 
gateway.
Restart the computer, and verify that the N750 wireless gigabit router address (192.168.1.1) is 
listed by your computer as the default gateway address.
Troubleshooting Connectivity Using the Ping Utility
Most computers and routers have a diagnostic utility called ping that sends an request to a target 
device. The device then replies. The ping utility makes it easy to troubleshoot a network.
Testing the Path from a PC to Your Router
You can ping the N750 wireless gigabit router to verify that the LAN path from your computer to 
your router is set up correctly.
The factory default N750 wireless gigabit router IP address is 192.168.1.1. 
However, if the router detects a conflict with the address it gets from your 
modem, it automatically picks a different address for itself. In this case, you can 
log in to the router using www.routerlogin.net to verify its LAN IP address. 
Select LAN Setup under Advanced on the main menu. Take note of the LAN 
TCP/IP setup IP address, which should match the default gateway IP address on 
your computer.
This section includes advanced troubleshooting techniques. 
						

							Troubleshooting33
To ping the wireless router:
1.
From the Windows toolbar, click Start and select Run.
2.In the field provided, type Ping followed by the address of the router, as in this example:
ping www.routerlogin.net
or
ping 192.168.1.1
3.Click OK.
You should see a message like this one:
Pinging 192.168.1.1 with 32 bytes of data
If the path is working, you see this message:
Reply from 192.168.1.1: 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 functioning correctly, you could have one of the following problems:
• Wrong physical connections
– Make sure that the LAN port light is on. If the light is off, follow the instructions in 
“Front Panel” on page 3.
– Check that the corresponding lights are on for your computer’s network interface 
card.
• Wrong network configuration
– Verify that the Ethernet card driver software and TCP/IP software are both installed 
and configured on your computer.
– Verify that the IP address for your router and your computer are correct and that the 
addresses on both begin with 255.255.255.0.
Testing the Path from a PC to the Internet
After verifying that the path between your computer and the N750 wireless gigabit router works 
correctly, test the path from your PC to the Internet. From the Windows Start > Run... menu, type:
PING -n 10 
where  is the IP address of a remote device such as your ISP’s DNS server. 
						

							Troubleshooting34
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 router listed as the default gateway. If the IP 
configuration of your PC is assigned by DHCP, this information is not visible in your PC’s 
Network Control Panel. Verify that the IP address of the router is listed as the TCP/IP default 
gateway.
• 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.
• If your ISP assigned a host name to your PC, enter that host name as the account name in the 
Basic Settings screen. 
						

							Technical Specifications35
Technical Specifications
Default Configuration Settings
This section provides factory default settings and technical specifications for the WNDR4000 
N750 Wireless Dual Band Gigabit Router .
Table 4.  Wireless Router Default Configuration Settings 
FeatureDefault Setting
Smart WizardEnabled
Router Login
Router Login URL http://www. routerlogin.net or 
http://www.routerlogin.com
Login name (case-sensitive) printed on 
product labeladmin
Login password (case-sensitive) printed 
on product labelpassword
Internet Connection
WAN MAC address Use default hardware address
MTU Size 1500
Local Network
Router LAN IP address printed on 
product label (also known as modem IP 
address)192.168.1.1
Router Subnet 255.255.255.0
DHCP Server Enabled
Time Zone GMT - 8 (North America only); 
other time zones vary by country and region
Time Zone Adjusted for Daylight Saving 
TimeDisabled 
						

							Technical Specifications36
Firewall
Inbound (communications coming in from 
the Internet)Disabled (bars all unsolicited requests)
Outbound (communications going out to 
the Internet)Enabled (all)
Wireless
Wireless Communication Enabled
Name (2.4GHz b/g/n SSID) NETGEAR
Name (5Ghz a/n SSID) NETGEAR-5G
Security Disabled
Broadcast SSID Enabled
Country/Region United States in the US, otherwise varies by region
11N 5GHz Channel 153 for North America, and 
44 for most other countries
11N 2.4GHz Channel Auto
Operating Mode Up to 450Mbps at 5GHz and 145Mbps at 2.4GHz 
a
Output Power Full
a. Maximum Wireless signal rate derived from IEEE Standard 802.11 specifications. Actual throughput will 
vary. Network conditions and environmental factors, including volume of network traffic, building 
materials and construction, and network overhead lower actual data throughput rate.
Network Protocol and Standards Compatibility
Data and Routing Protocols: TCP/IP, RIP-1, RIP-2, DHCP
PPP over Ethernet (PPPoE)
Power Adapter
North America 120V, 60 Hz, input
United Kingdom, Australia 240V, 50 Hz, input
Europe 230V, 50 Hz, input
All regions (output) 12 V DC @ 2.5A output, 30W maximum
Table 4.  Wireless Router Default Configuration Settings (continued)
FeatureDefault Setting