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Page 131 / 167 Scroll up to view Page 126 - 130
Chapter 9.
Troubleshooting
|
131
N300 Wireless ADSL2+ Modem Router DGN2200
•
Make sure 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.
Troubleshooting the Internet Connection
If your modem router is unable to access the Internet, you should check the ADSL
connection, then the WAN TCP/IP connection.
ADSL Link
If your modem router is unable to access the Internet, you should first determine whether you
have an ADSL link with the service provider. The state of this connection is indicated with the
Internet LED.
ADSL Link LED Is Green
If your ADSL link LED is green, then you have a good ADSL connection. You can be
confident that the service provider has connected your line correctly and that your wiring is
correct.
ADSL Link LED Is Blinking Green
If your ADSL link LED is blinking green, then your modem router is attempting to make an
ADSL connection with the service provider. The LED should turn green within several
minutes.
If the ADSL link LED does not turn green, disconnect all telephones on the line. If this solves
the problem, reconnect the telephones one at a time, being sure to use a microfilter on each
telephone. If the microfilters are connected correctly, you should be able to connect all your
telephones.
If disconnecting telephones does not result in a green ADSL link LED, there might be a
problem with your wiring. If the telephone company has tested the ADSL signal at your
network interface device (NID), then you might have poor-quality wiring in your house.
ADSL Link LED Is Off
If the ADSL link LED is off, disconnect all telephones on the line. If this solves the problem,
reconnect the telephones one at a time, being sure to use a microfilter on each telephone. If
the microfilters are connected correctly, you should be able to connect all your telephones.
If disconnecting telephones does not result in a green ADSL link LED, check for the following:
•
Check that the telephone company has made the connection to your line and tested it.
•
Verify that you are connected to the correct telephone line. If you have more than one
phone line, be sure that you are connected to the line with the ADSL service. It might be
necessary to use a swapper if your ADSL signal is on pins 1 and 4 or the RJ-11 jack. The
modem router uses pins 2 and 3.
Page 132 / 167
132
|
Chapter 9.
Troubleshooting
N300 Wireless ADSL2+ Modem Router DGN2200
Internet LED Is Red
If the Internet LED is red, the device was unable to connect to the Internet. Verify the
following:
•
Check that your login credentials are correct, or that the information you entered on the
Basic Settings screen is correct.
•
Check with your ISP to verify that the multiplexing method, VPI, and VCI settings on the
ADSL settings screen are correct.
•
Check if your ISP has a problem—it might not be that the modem router cannot connect
to the Internet but , rahter that your ISP that cannot provide an Internet connection.
Obtaining an Internet IP Address
If your modem router is unable to access the Internet, and your Internet LED is green, you
should determine whether the modem router is able to obtain an Internet IP address from the
ISP. Unless you have been assigned a static IP address, your modem router requests an IP
address from the ISP. You can determine whether the request was successful using the
browser interface.
To check the Internet IP address from the browser interface:
1.
Launch your browser, and select an external site such as
www.netgear.com
.
2.
Access the main menu of the modem router’s configuration at http://192.168.0.1.
3.
In the main menu, under Maintenance, select
Router Status
and check that an IP address
is shown for the WAN port. If 0.0.0.0 is shown, your modem router has not obtained an IP
address from your ISP.
If your modem router is unable to obtain an IP address from the ISP, the problem might be
one of the following:
•
If you have selected a login program, the service name, user name, or password might be
incorrectly set. See the following section,
Troubleshooting PPPoE or PPPoA
.
•
Your ISP might check for your computer’s host name. Assign the computer host name of
your ISP account to the modem router in the browser-based Setup Wizard.
•
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
modem router’s MAC address.
-
Configure your modem router to spoof your computer’s MAC address. This can be
done in the Basic Settings screen.
Page 133 / 167
Chapter 9.
Troubleshooting
|
133
N300 Wireless ADSL2+ Modem Router DGN2200
Troubleshooting PPPoE or PPPoA
The PPPoE or PPPoA connection can be debugged as follows:
1.
Access the main menu of the modem router at http://192.168.0.1.
2.
Select
Maintenance > Router Status
.
3.
Click the
Connection Status
button.
4.
If all of the steps indicate OK, then your PPPoE or PPPoA connection is up and working.
5.
If any of the steps indicates Failed, you can attempt to reconnect by clicking
Connect
. The
modem 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.
Note:
Unless you connect manually, the modem router will not
authenticate using PPPoE or PPPoA until data is transmitted to the
network.
Troubleshooting Internet Browsing
If your 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 when you set up the modem
router, reboot your computer, and verify the DNS address. Alternatively, you can
configure your computer manually with DNS addresses, as explained in your operating
system documentation
.
•
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 as described in the online document that
you can access from
Preparing Your Network
in Appendix
D.
TCP/IP Network Not Responding
Most TCP/IP terminal devices and routers have a ping utility for sending an echo request
packet to the designated device. The device responds with an echo reply to tell whether a
TCP/IP network is responding to requests.
Page 134 / 167
134
|
Chapter 9.
Troubleshooting
N300 Wireless ADSL2+ Modem Router DGN2200
Test the LAN Path to Your Modem Router
You can ping the modem router from your computer 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 task bar, 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:
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
If the path is not functioning 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, follow the instructions in
LAN LED Is Off
on page
130.
-
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 modem
router.
•
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 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 you verify that the LAN path works correctly, test the path from your PC to a remote
device. In the Windows Run screen, 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 described in
Test the LAN Path to Your Modem
Router
on page
134 display. If you do not receive replies:
Page 135 / 167
Chapter 9.
Troubleshooting
|
135
N300 Wireless ADSL2+ Modem Router DGN2200
•
Check that your PC has the IP address of your modem router listed as the default modem
router. 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 modem
router is listed as the default router.
•
Check 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 or DSL modem is connected and functioning.
•
If your ISP assigned a host name to your PC, enter that host name as the account name
in the Basic Settings screen.
•
Your ISP could be rejecting the Ethernet MAC addresses of all but one of your PCs. Many
broadband ISPs restrict access by allowing traffic only from the MAC address of your
modem, but some additionally restrict access to the MAC address of a single PC
connected to that modem. In this case, configure your modem router to clone or spoof the
MAC address from the authorized PC.
Cannot Log in
If you cannot log in to the modem router from a computer on your local network, check the
following:
•
The modem router is plugged in and it is on.
•
You are using the correct login information. The login name is admin, and the password is
password. Make sure that Caps Lock is off when you enter this information.
•
If you cannot connect wirelessly, try an Ethernet connection and view the modem router
wireless settings and set up your wireless computer with corresponding wireless settings.
•
If you are using an Ethernet-connected computer, check the Ethernet connection
between the computer and the modem router. The LAN LED for the port you are using on
the modem router should light up to show your connection.
•
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 should be in the range
192.168.0.2 to 192.168.0.254.
•
If the computer IP address is 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. The
auto-generated addresses are in the range 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 was changed and you do not know the current IP
address, clear the modem router’s configuration to factory defaults as explained in
Factory Settings
on page
138. This sets the modem router’s IP address to 192.168.0.1.
•
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 relaunching it.

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