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router
restores the original address information replaced by NAT and sends this reply message to
your computer.
7.
When your
modem router
receives the incoming message to destination port 113, it checks its session
table and finds an active session for port 113 associated with your computer. The
modem router
replaces the message’s destination IP address with your computer’s IP address and forwards the
message to your computer.
8.
When you finish your chat session, your
modem router
eventually senses a period of inactivity in the
communications.The
modem router
then removes the session information from its session table, and
incoming traffic is no longer accepted on port numbers 33333 or 113.
Manage Port Forwarding and Port Triggering
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Nighthawk AC1900 WiFi VDSL/ADSL Modem Router Model D7000
Page 292 / 312
14
Diagnostics and Troubleshooting
This chapter provides information to help you diagnose and solve problems you might experience with your
modem router
. If you do not find the solution here, check the NETGEAR support site at
for product and contact information.
This chapter contains the following sections:
•
Perform Diagnostics
on page 292
•
Quick Tips for Troubleshooting
on page 295
•
Troubleshoot with the LEDs
on page 297
•
You Cannot Log In to the Modem Router
on page 298
•
Troubleshoot the Internet Connection
on page 299
•
Changes Are Not Saved
on page 304
•
Troubleshoot the WiFi Connectivity
on page 304
•
Troubleshoot Your Network Using the Ping Utility
on page 305
292
Page 293 / 312
Perform Diagnostics
The
modem router
lets you perform various diagnostic tasks. For normal operation, these tasks are not
required.
Perform a DNS Lookup
Use this test to find the IP address of a web, FTP, mail, or other server on the Internet.
To look up an IP address:
1.
Launch an Internet browser from a computer or WiFi device that is connected to the network.
2.
Type
.
A login window opens.
3.
Enter the user name and password for the
modem router
.
The user name is
admin
. The default password is
password
. The user name and password are
case-sensitive.
4.
Click the
OK
button.
The BASIC Home page displays.
5.
Select
ADVANCED > Administration > Diagnostics
.
The Diagnostics page displays.
6.
In the
Internet Name
field, enter the server’s host name such as www.netgear.com.
7.
Click the
Lookup
button.
The results of the lookup display in the
IP address
and
DNS Server
fields.
Ping an IP Address
Use this test to send a ping packet request to an IP address to test the connection. If the request times
out because no reply is received, the destination might be unreachable. However, some network devices
can be configured not to respond to a ping.
To ping an IP address:
1.
Launch an Internet browser from a computer or WiFi device that is connected to the network.
2.
Type
.
A login window opens.
3.
Enter the user name and password for the
modem router
.
Diagnostics and Troubleshooting
293
Nighthawk AC1900 WiFi VDSL/ADSL Modem Router Model D7000
Page 294 / 312
The user name is
admin
. The default password is
password
. The user name and password are
case-sensitive.
4.
Click the
OK
button.
The BASIC Home page displays.
5.
Select
ADVANCED > Administration > Diagnostics
.
The Diagnostics page displays.
6.
In the
IP address
field, enter an IP address.
7.
Click the
Ping
button.
The Diagnostics - Ping page displays the results of the ping test.
To return to the Diagnostics page, click the
Back
button.
Display the Routing Table
Displaying the
modem router
’s internal routing table can assist you or
NETGEAR
technical support in
diagnosing routing problems.
To display the routing table:
1.
Launch an Internet browser from a computer or WiFi device that is connected to the network.
2.
Type
.
A login window opens.
3.
Enter the user name and password for the
modem router
.
The user name is
admin
. The default password is
password
. The user name and password are
case-sensitive.
4.
Click the
OK
button.
The BASIC Home page displays.
5.
Select
ADVANCED > Administration > Diagnostics
.
The Diagnostics page displays.
6.
Click the
Display
button.
The Diagnostics - Routing Table page displays the routing table.
Diagnostics and Troubleshooting
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Nighthawk AC1900 WiFi VDSL/ADSL Modem Router Model D7000
Page 295 / 312
To return to the Diagnostics page, click the
Back
button.
Reboot the
Modem Router
from the Web Management
Interface
You or
NETGEAR
technical support can reboot the
modem router
from the web management interface,
either locally or remotely, for example, when the
modem router
seems to be unstable or is not operating
normally.
To reboot the
modem router
from the web management interface:
1.
Launch an Internet browser from a computer or WiFi device that is connected to the network.
2.
Type
.
A login window opens.
3.
Enter the user name and password for the
modem router
.
The user name is
admin
. The default password is
password
. The user name and password are
case-sensitive.
4.
Click the
OK
button.
The BASIC Home page displays.
5.
Select
ADVANCED > Administration > Diagnostics
.
The Diagnostics page displays.
6.
Click the
Reboot
button.
A confirmation pop-up window displays.
7.
Click the
OK
button.
The
modem router
reboots.
Quick Tips for Troubleshooting
The following table includes tips for troubleshooting some common problems.
Table 27. Quick tips for troubleshooting
Possible Solution
Problem
Restart your network:
Your network is
unresponsive or does
not function normally.
Diagnostics and Troubleshooting
295
Nighthawk AC1900 WiFi VDSL/ADSL Modem Router Model D7000

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