Netgear Dgnd3700v2 N600 Wireless Dual Band Gigabit Adsl2 Plus Modem Router User Manual

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131  N600 Wireless Dual Band Gigabit ADSL2+ Modem Router DGND3700v2
Quick Tips
This section describes tips for troubleshooting some common problems.
Sequence to Restart Your Network
Be sure to restart your network in this sequence:
1. Turn off and unplug the modem. 
2. Turn off the wireless modem router and computers.
3. Plug in the modem and turn it on. Wait two minutes.
4. Turn on the wireless modem router and wait two minutes.
5. Turn on the computers.
Check Ethernet Cable Connections
Make sure that the Ethernet cables are securely plugged in. 
•The Internet status LED on the wireless modem router is on if the Ethernet cable 
connecting the wireless modem router and the modem is plugged in securely and the 
modem and wireless modem router are turned on. 
•For each powered-on computer connected to the wireless modem router by an Ethernet 
cable, the corresponding numbered router LAN port LED is on. 
Wireless Settings
Make sure that the wireless settings in the computer and wireless modem router match 
exactly. 
•For a wirelessly connected computer, the wireless network name (SSID) and wireless 
security settings of the wireless modem router and wireless computer need to match 
exactly. 
•If you set up an access list in the Advanced Wireless Settings screen, you have to add 
each wireless computer’s MAC address to the wireless modem router’s access list.
Network Settings
Make sure that the network settings of the computer are correct. 
•Wired and wirelessly connected computers need to have network (IP) addresses on the 
same network as the wireless modem router. The simplest way to do this is to configure 
each computer to obtain an IP address automatically using DHCP. 
•Some cable modem service providers require you to use the MAC address of the 
computer initially registered on the account. You can view the MAC address in the 
Attached Devices screen. 
						

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N600 Wireless Dual Band Gigabit ADSL2+ Modem Router DGND3700v2 
Troubleshoot with the LEDs
After you turn on power to the wireless modem router, the following sequ\
ence of events 
should occur:
1.  When power is first applied, verify that the Power LED 
 is on.
2.  V
erify that the Power LED turns red within a few seconds, indicating that\
 the self-test is 
running.
3.  After approximately 30 seconds, verify that:
• The Power LED is solid green.
• The Internet LED is on.
• A numbered Ethernet port LED is on for any local port that is connected \
to a 
computer

. This indicates that a link has been established to the connected device.\
The LEDs on the front panel of the wireless modem router can be used for\
 troubleshooting.
Power LED Is Off or Blinking
• Make sure that the power cord is securely connected to your wireless mod\
em router and 
that the power adapter is securely connected to a functioning power outl\
et. 
• Check that you are using the 12V DC, 2.5A power adapter that NETGEAR sup\
plied for 
this product.
• If the Power LED blinks slowly and continuously
 , the wireless modem router firmware is 
corrupted. This can happen if a firmware upgrade is interrupted, or if the wireless\
 modem 
router detects a problem with the firmware. If the error persists, you h\
ave a hardware 
problem. For recovery instructions, or help with a hardware problem, con\
tact technical 
support at  www.netgear.com/support .
Power LED Stays Red
When the wireless modem router is turned on, the Power LED turns red for\
 about 20 seconds 
and then turns green. If the LED does not turn green, the wireless modem\
 router has a 
problem.
If the Power LED is still red one minute after you turn on power to the \
wireless modem router:
1. T
urn the power off and back on to see if the wireless modem router recovers.
2.  Press and hold the  Restore Factory Settings button to return the wireless modem 
router to its factory settings. See  Factory Settings on page 142.
If the error persists, you might have a hardware problem and should cont\
act technical 
support at www.netgear.com/support . 
						

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133  N600 Wireless Dual Band Gigabit ADSL2+ Modem Router DGND3700v2
LEDs Never Turn Off
When the wireless modem router is turned on, the LEDs turn on for about 10 seconds and 
then turn off. If all the LEDs stay on, there is a fault within the wireless modem router.
If all LEDs are still on 1 minute after power-up:
•Cycle the power to see if the wireless modem router recovers.
•Press and hold the Restore Factory Settings button to return the wireless modem router 
to its factory settings. See 
Factory Settings on page 142.
If the error persists, you might have a hardware problem and should contact technical 
support at 
www.netgear.com/support.
Internet or Ethernet Port LEDs Are Off
If either the Ethernet port LEDs or the Internet LED does not light when the Ethernet 
connection is made, check the following:
•Make sure that the Ethernet cable connections are secure at the wireless modem router 
and at the modem or computer.
•Make sure that power is turned on to the connected modem or computer.
•Be sure that you are using the correct cable:
When connecting the wireless modem router’s Internet port to a cable or DSL modem, 
use the cable that was supplied with the cable or DSL modem. This cable could be a 
standard straight-through Ethernet cable or an Ethernet crossover cable.
Wireless LEDs Are Off
If the Wireless LEDs stay off, check to see if the Wireless On/Off button on the wireless 
modem router has been pressed. This button turns the wireless radios in the wireless modem 
router on and off. The Wireless LEDs are lit when the wireless radio is turned on.
The Push N Connect (WPS) Button Blinks Red
If after you push the WPS function and the button blinks red, check the following:
•Make sure that you are using the button and not the wireless modem router’s built-in 
registrar.
•Check that PIN verification has succeeded for the wireless device you are adding to the 
wireless network.
•Make sure you have not pressed the WPS button on the top of the wireless modem router 
after disabling the WPS feature (you logged in to the wireless modem router and disabled 
this previously).
•Check that the wireless modem router is not in the temporary AP setup locked state (if 
you are using the wireless repeater function). 
						

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Cannot Log In to the Router
If you are unable to log in to the wireless modem router from a computer on your local 
network, check the following:
•If you are using an Ethernet-connected computer, check the Ethernet connection 
between the computer and the wireless modem router as described in the previous 
section.
•Make sure that your computer’s IP address is on the same subnet as the wireless modem 
router. If you are using the recommended addressing scheme, your computer’s address 
should be in the range of 192.168.1.2 to 192.168.1.254. 
•If your computer’s IP address is shown as 169.254.x.x, recent versions of Windows and 
MacOS 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 wireless modem router, and 
reboot your computer.
•If your wireless modem router’s IP address was changed and you do not know the current 
IP address, clear the wireless modem router’s configuration to factory defaults. This sets 
the wireless modem router’s IP address to 192.168.1.1. This procedure is explained in 
Factory Settings on page 142.
•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 quitting the browser and launching it again.
•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.
•If you are attempting to set up your NETGEAR wireless modem router as an additional 
router behind an existing router in your network, consider replacing the existing router 
instead. NETGEAR does not support such a configuration.
•If you are attempting to set up your NETGEAR wireless modem router as a replacement 
for an ADSL gateway in your network, the wireless modem router cannot perform many 
gateway services, for example, converting ADSL or cable data into Ethernet networking 
information. NETGEAR does not support such a configuration.
Cannot Access the Internet
If you can access your router but you are unable to access the Internet, first determine 
whether the wireless modem router can obtain an IP address from your Internet service 
provider (ISP). Unless your ISP provides a fixed IP address, your wireless modem router 
requests an IP address from the ISP. You can determine whether the request was successful 
using the Router Status screen. 
						

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To check the WAN IP address: 
1. Start your browser, and select an external site such as http://www.netgear.com.
2. Access the wireless modem router interface at http://www.routerlogin.net.
3. Select Administration > Router Status.
4. Check that an IP address is shown for the Internet port. If 0.0.0.0 is shown, your wireless 
modem router has not obtained an IP address from your ISP.
If your wireless modem router cannot obtain an IP address from the ISP, you might need to 
force your cable or DSL modem to recognize your new wireless modem router by restarting 
your network, as described in 
Sequence to Restart Your Network on page 131.
If your wireless modem router is still unable to obtain an IP address from the ISP, the problem 
might be one of the following:
•Your Internet service provider (ISP) might require a login program. 
Ask your ISP whether they require PPP over Ethernet (PPPoE) or some other type of 
login.
•If your ISP requires a login, the login name and password might be set incorrectly.
•Your ISP might check for your computer’s host name. 
Assign the computer host name of your ISP account as the account name in the Internet 
Basic Settings screen.
•Your ISP 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 ISP that you have bought a new network device, and ask them to use the 
wireless modem router’s MAC address.
-Configure your wireless modem router to clone your computer’s MAC address.
If your wireless modem router can obtain an IP address, but your computer is unable to load 
any web pages from the Internet:
•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 during the wireless modem 
router’s configuration, reboot your computer, and verify the DNS address.You can 
configure your computer manually with DNS addresses, as explained in your operating 
system documentation.
•Your computer might not have the wireless modem router configured as its TCP/IP 
gateway.
If your computer obtains its information from the wireless modem router by DHCP, reboot 
the computer, and verify the gateway address.
•You might be running login software that is no longer needed.
If your ISP provided a program to log you in to the Internet (such as WinPoET), you no 
longer need to run that software after installing your wireless modem router. You might  
						

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need to go to Internet Explorer and select Tools > Internet Options, click the 
Connections tab, and select Never dial a connection.
Troubleshoot PPPoE
If you are using PPPoE, try troubleshooting your Internet connection.
To troubleshoot a PPPoE connection:
1. Log in to the wireless modem router.
2. Select Administration > Router Status.
3. Click Connection Status. If all of the steps indicate OK, then your PPPoE connection is 
up and working.
If any of the steps indicate Failed, you can attempt to reconnect by clicking Connect. The 
wireless modem router continues 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.
Note:Unless you connect manually, the wireless modem router does not 
authenticate using PPPoE until data is transmitted to the network.
Troubleshoot Internet Browsing
If your wireless modem 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 during the wireless modem router’s configuration, restart your 
computer.
Alternatively, you can configure your computer manually with a DNS address, as 
explained in the documentation for your computer.
•Your computer might not have the wireless modem router configured as its default 
gateway.
Reboot the computer, and verify that the wireless modem router address 
(www.routerlogin.net) is listed by your computer as the default gateway address.
•You might be running login software that is no longer needed. If your ISP provided a 
program to log you in to the Internet (such as WinPoET), you no longer need to run that 
software after installing your wireless modem router. You might need to go to Internet  
						

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Explorer and select Tools > Internet Options, click the Connections tab, and select 
Never dial a connection.
If the wireless modem router does not save changes you have made in the browser 
interface, check the following:
•When entering configuration settings, be sure to click Apply before moving to another 
screen or tab, or your changes could be lost.
•Click Refresh or Reload in the web browser. The changes might have occurred, but the 
web browser might be caching the old configuration.
Changes Not Saved
If the wireless modem router does not save the changes you make in the wireless modem 
router interface, check the following:
•When entering configuration settings, always click the Apply button before moving to 
another screen or tab, or your changes are lost. 
•Click the Refresh or Reload button in the web browser. The changes might have 
occurred, but the old settings might be in the web browser’s cache.
Incorrect Date or Time
Select Advanced > Security > Schedule to display the current date and time. The wireless 
modem router uses the Network Time Protocol (NTP) to obtain the current time from one of 
several network time servers on the Internet. Each entry in the log is stamped with the date 
and time of day. Problems with the date and time function can include the following:
•Date shown is January 1, 2000. This means the wireless modem router has not yet 
successfully reached a network time server. Check that your Internet access is 
configured correctly. If you have just finished setting up the wireless modem router, wait 
at least five minutes, and check the date and time again.
•Time is off by one hour. The wireless modem router does not automatically sense 
daylight saving time. In the Schedule screen, select the Automatically adjust for daylight 
savings time check box.
Wireless Connectivity
If you are having trouble connecting wirelessly to the wireless modem router, try to isolate the 
problem. 
•Does the wireless device or computer that you are using find your wireless network?
If not, check the Wireless LEDs on the front of the wireless modem router. They should 
be lit. If they are not, you can press the WiFi On/Off button on the back of the wireless 
modem router to turn the wireless modem router’s wireless radio back on. 
						

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If you disabled the wireless modem router’s SSID broadcast, then your wireless network 
is hidden and does not show up in your wireless client’s scanning list. (By default, SSID 
broadcast is enabled.)
•Does your wireless device support the security that you are using for your wireless 
network (WPA or WPA2)?
•If you want to view the wireless settings for the wireless modem router, use an Ethernet 
cable to connect a computer to a LAN port on the wireless modem router. Then log in to 
the wireless modem router and select Setup > Wireless Settings see (
Basic Wireless 
Settings on page 35). 
Note:Be sure to click Apply if you make changes.
Wireless Signal Strength
If your wireless device finds your network, but the signal strength is weak, check these 
conditions:
•Is your wireless modem router too far from your computer, or too close? Place your 
computer near the wireless modem router, but at least 6 feet away, and see whether the 
signal strength improves.
•Is your wireless signal blocked by objects between the wireless modem router and your 
computer?
Restore the Factory Settings and Password
This section explains how to restore the factory settings, changing the wireless modem 
router’s administration password back to password. You can erase the current configuration 
and restore factory defaults in two ways:
•Use the Erase function of the wireless modem router (see Erase on page 93).
•Use the Restore Factory Settings button on the back of the wireless modem router. See 
Factory Settings on page 142. If you restore the factory settings and the wireless modem 
router fails to restart, or the green Power LED continues to blink, the unit might be 
defective. If the error persists, you might have a hardware problem and should contact 
technical support at 
http://www.netgear.com/support.
Troubleshoot Your Network Using the Ping Utility
Most network 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 network by using the ping utility in your computer or workstation.  
						

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139  N600 Wireless Dual Band Gigabit ADSL2+ Modem Router DGND3700v2
Test the LAN Path to Your Router
You can ping the wireless modem router from your computer to verify that the LAN path to 
your wireless modem router is set up correctly.
To ping the wireless modem router from a computer running Windows:
1. From the Windows toolbar, click Start, and then select Run.
2. In the field provided, type ping followed by the IP address of the wireless modem router, as 
in this example:
ping www.routerlogin.net
3. Click OK.
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 functioning correctly, you could have one of the following problems:
•Wrong physical connections
For a wired connection, make sure that the numbered LAN port LED is on for the port to 
which you are connected.
Check that the appropriate LEDs are on for your network devices. If your wireless modem 
router and computer are connected to a separate Ethernet switch, make sure that the 
Ethernet LEDs are on for the switch ports that are connected to your computer and 
wireless modem router.
•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 wireless modem router and your computer 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.
1. From the Windows toolbar, click the Start button, and then select Run.
2. In the Windows Run window, type:
ping -n 10  
						

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where  is the IP address of a remote device such as your ISP’s DNS server.
If the path is functioning correctly, replies like those shown in the previous section are 
displayed.
If you do not receive replies:
•Check that your computer has the IP address of your wireless modem router listed as the 
default gateway. If the IP configuration of your computer is assigned by DHCP, this 
information is not be visible in your computer’s Network Control Panel. Verify that the IP 
address of the wireless modem router is listed as the default gateway.
•Check to see that the network address of your computer (the portion of the IP address 
specified by the subnet mask) is different from the network address of the remote device.
•Check that your cable or DSL modem is connected and functioning.
•If your ISP assigned a host name to your computer, enter that host name as the account 
name in the Internet Basic Settings screen.
•Your ISP could be rejecting the Ethernet MAC addresses of all but one of your 
computers.
Many broadband ISPs restrict access by allowing traffic only from the MAC address of your 
broadband modem, but some ISPs additionally restrict access to the MAC address of a 
single computer connected to that modem. If this is the case, configure your wireless modem 
router to “clone” or “spoof” the MAC address from the authorized computer.