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Page 186 / 202 Scroll up to view Page 181 - 185
Manage Port Forwarding and Port
Triggering
186
N600 and AC750 WiFi DSL Modem Routers
The following sequence shows the effects of this port triggering rule:
1.
You open an IRC client program to start a chat session on your computer.
2.
Your IRC client composes a request message to an IRC server using a destination port
number of 6667, the standard port number for an IRC server process. Your computer then
sends this request message to your modem router.
3.
Your modem router creates an entry in its internal session table describing this
communication session between your computer and the IRC server. Your modem router
stores the original information, performs Network Address Translation (NAT) on the source
address and port, and sends this request message through the Internet to the IRC server.
4.
Noting your port triggering rule and observing the destination port number of 6667, your
modem router creates another session entry to send any incoming port 113 traffic to your
computer.
5.
The IRC server sends a return message to your modem router using the NAT-assigned
source port (for example, port 33333) as the destination port and the IRC server also sends
an “identify” message to your modem router with destination port 113.
6.
When your modem router receives the incoming message to destination port 33333, it
checks its session table to see if a session is active for port number 33333. Finding an active
session, the modem 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.
Page 187 / 202
187
12
12.
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:
•
Quick Tips for Troubleshooting
•
Troubleshoot with the LEDs
•
You Cannot Log In to the Modem Router
•
Troubleshoot the Internet Connection
•
Changes Are Not Saved
•
Troubleshoot the WiFi Connectivity
•
Troubleshoot Your Network Using the Ping Utility
Page 188 / 202
Troubleshooting
188
N600 and AC750 WiFi DSL Modem Routers
Quick Tips for Troubleshooting
The following table includes tips for troubleshooting some common problems.
Table 3.
Quick tips for troubleshooting
Problem
Possible Solution
Your network is unresponsive
or does not function normally.
Restart your network:
1.
Turn off and unplug the DSL, cable, or fiber modem.
2.
Turn off the modem router.
3.
Plug in the DSL, cable, or fiber modem and turn it on. Wait two minutes.
4.
Turn on the modem router and wait two minutes.
If network problems still occur, make sure that your ISP does not require you to
use the MAC address of the computer that was used to initially register the ISP
account. If your ISP does require that you do this, you must change the router
MAC address that the modem router uses. For more information, see
Manually
Set Up the Internet Connection
on page
44.
Your cannot connect over an
Ethernet cable to the modem
router.
•
Make sure that the Ethernet cables are securely plugged in.
•
Make sure that your computer or device does not use a static IP address
but is configured to receive an IP address automatically with DHCP. (For
most devices, DHCP is the default setting.)
You cannot connect over WiFi
to the modem router.
•
Make sure that the WiFi settings in your WiFi device and modem router
match exactly.
•
Make sure that your WiFi device supports the security that you are using
for your WiFi network (WEP, WPA, or WPA2). For information about WiFi
security settings, see
Manage the Basic WiFi Settings and WiFi Security of
the Main Network
on page
56.
•
Make sure that the modem router is not too far from your WiFi device or too
close:
-
Move your WiFi device near the modem router but at least 6 feet
(2
meters) away and see if the signal strength improves.
-
Make sure that the WiFi signal is not blocked by objects between the
modem router and your WiFi device.
•
Make sure that the WiFi LED on the modem router is not off.
•
Make sure that the modem router’s SSID broadcast is not disabled.
•
Make sure that your WiFi device does not use a static IP address but is
configured to receive an IP address automatically with DHCP. (For most
devices, DHCP is the default setting.)
For a device that is connected over WiFi, the WiFi network name (SSID)
and WiFi security settings of the modem router and WiFi computer must
match exactly. The default SSID and password are on the product label (see
Bottom Panel Product Label
on page
13).
If this LED is off, both WiFi radios might be disabled. For more information
about the WiFi radios, see
Control the WiFi Radios
on page
73.
If the modem router’s SSID broadcast is disabled, the WiFi network name is
hidden and does not display in your WiFi device’s scanning list. To connect
to a hidden network, you must type the network name and the WiFi
password. For more information about the SSID broadcast, see
Manage the
Basic WiFi Settings and WiFi Security of the Main Network
on page
56.
Page 189 / 202
Troubleshooting
189
N600 and AC750 WiFi DSL Modem Routers
Troubleshoot with the LEDs
When you turn on the power, the LEDs light as described here.
1.
When power is first applied, the Internet LED
lights solid green for about 20 seconds
and then starts blinking.
2.
After approximately 25 seconds after turning on the power, the following occurs:
-
The WiFi LED
lights green.
-
The WPS LED
lights green.
-
If the modem router is connected to an active ADSL service, the DSL LED
blinks
green to indicate that the modem router is negotiating the best possible speed on the
DSL line. If the negotiation completes and a DSL link is established, the LED turns
solid green. If you do not use a DSL modem but a cable or fiber modem, the DSL LED
remains off.
3.
After approximately 40 seconds after turning on the power, the Ethernet LED
lights
green for any Ethernet devices that are connected.
4.
After approximately 80 seconds after turning on the power, the Power LED
lights solid
green, indicating that the startup procedure is complete.
5.
When an Internet connection is established, the Internet LED
lights solid green.
Power LED Is Off
If the Power LED
and other LEDs are off when your modem router is turned on, do the
following:
•
Check that the power cord is correctly connected to your modem router and that the
power supply adapter is correctly connected to a functioning power outlet.
•
Check that you are using the 12 VDC 1.2A power adapter that NETGEAR supplied for
this product.
If the error persists, a hardware problem might exist. For recovery instructions or help with a
hardware problem, contact technical support at
www.netgear.com/support.
WiFi LED Is Off
If the WiFi LED
remains off, check to see if the radios on the modem router are turned off
(see
Control the WiFi Radios
on page
73). By default, the radios are turned on and the WiFi
LED lights solid green.
Page 190 / 202
Troubleshooting
190
N600 and AC750 WiFi DSL Modem Routers
Ethernet LED Is Off
If the Ethernet LED
does not light when you connect a device, check the following:
•
The Ethernet cable connections are secure at the modem router and at the hub or device.
•
The power is turned on to the connected hub or device.
•
You are using the correct cable.
You Cannot Log In to the Modem Router
If you are unable to log in to the modem router from a computer on your local network and
use the web management interface, check the following:
•
If you are using an Ethernet-connected computer, check the Ethernet connection
between the computer and the modem router.
•
If the computer is set to a static or fixed IP address (this setting is uncommon), either
change the computer to obtain an IP address automatically from the modem router
through DHCP, or change the IP address of the computer to a static or fixed IP address in
the 192.168.1.2–192.168.1.254 range.
•
Make sure that your computer can reach the modem router’s DHCP server. 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 was changed and you do not know the current IP
address, use an IP scanner application to detect the IP address. If you still cannot find the
IP address, clear the modem router’s configuration to factory defaults. This sets the
modem router’s IP address to 192.168.1.1. For more information, see
Return the Modem
Router to Its Factory Default Settings
on page
155 and
Factory Settings
on page
199.
•
Make sure that Java, JavaScript, or ActiveX is enabled in your browser. If you are using
Internet Explorer, click the
Refresh
button 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 user name is
admin
, and
the default password is
password
. Make sure that Caps Lock is off when you enter this
information.
•
If you are attempting to set up your modem router as a replacement for an ADSL gateway
in your network, the modem router cannot perform many gateway services. For example,
the modem router cannot convert ADSL or cable data into Ethernet networking
information. NETGEAR does not support such a configuration.

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