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Specify Internet Port Settings
166
Nighthawk AC1750
Smart
WiFi
Router
also sends an “identify” message to your computer on port 113. Using port triggering, you can
tell the router, “When you initiate a session with destination port 6667, you must also allow
incoming traffic on port 113 to reach the originating computer.” 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 router.
3.
Your router creates an entry in its internal session table describing this communication
session between your computer and the IRC server. Your 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
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 router using the NAT-assigned source port
(for example, port 33333) as the destination port and sends an “identify” message to your
router with destination port 113.
6.
When your 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 router restores the original address information replaced by NAT and sends this reply
message to your computer.
7.
When your 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
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 router eventually senses a period of inactivity in the
communications. The router then removes the session information from its session table,
and incoming traffic is no longer accepted on port numbers 33333 or 113.
Page 167 / 180
167
14
14.
Troubleshooting
This chapter provides information to help you diagnose and solve problems you might
experience with your 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
•
Troubleshoot with the LEDs
•
Cannot Log In to the Router
•
Cannot Access the Internet
•
Changes Not Saved
•
Wireless Connectivity
•
Troubleshoot Your Network Using the Ping Utility
Page 168 / 180
Troubleshooting
168
Nighthawk AC1750
Smart
WiFi
Router
Quick Tips
See the following for tips for troubleshooting some common problems:
•
Sequence to Restart Your Network
on page
168
•
Check Ethernet Cable Connections
on page
168
•
Wireless Settings
on page
168
•
Network Settings
on page
168
Sequence to Restart Your Network
When you must to restart your network, follow this sequence:
1.
Turn off
and
unplug the modem.
2.
Turn off the router.
3.
Plug in the modem and turn it on. Wait two minutes.
4.
Turn on the router and wait two minutes.
Check Ethernet Cable Connections
If your device does not power on, make sure that the Ethernet cables are securely plugged
in. The Internet LED on the router is lit if the Ethernet cable connecting the router and the
modem is plugged in securely and the modem and router are turned on. If one or more
powered-on computers are connected to the router by an Ethernet cable, the corresponding
numbered router LAN port LEDs light.
Wireless Settings
Make sure that the wireless settings in the computer and router match exactly. The wireless
network name (SSID) and wireless security settings of the router and wireless computer must
match exactly.
If you set up an access list in the Advanced Wireless Settings screen, you must add each
wireless computer’s MAC address to the router’s access list.
Network Settings
Make sure that the network settings of the computer are correct. Wired and wirelessly
connected computers must use network (IP) addresses on the same network as the 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.
Page 169 / 180
Troubleshooting
169
Nighthawk AC1750
Smart
WiFi
Router
Troubleshoot with the LEDs
By default, the router is set with standard LED settings. If you disabled blinking for the LEDs
or turned off all LEDs except the Power LED, you must return the LEDs to their standard
settings for troubleshooting. For information about controlling the LED settings, see
Disable
LED Blinking or Turn Off LEDs
on page
104.
Standard LED Behavior When the Router Is Powered On
After you turn on power to the router, the following sequence of events occurs:
1.
When power is first applied, verify that the Power LED
is lit.
2.
After approximately 30 seconds, verify the following:
•
The Power LED is solid white.
•
The Internet LED is lit.
•
The WiFi LED is lit unless you turned off the wireless radio.
You can use the LEDs on the front panel of the router for troubleshooting.
Power LED Is Off or Blinking
Is the Power LED is off or blinking, try the following:
•
Make sure that the power adapter is securely connected to your router and securely
connected to a working power outlet.
•
Check that you are using the power adapter that NETGEAR supplied for this product.
•
If the Power LED blinks slowly and continuously, the router firmware is corrupted. This
can happen if a firmware upgrade is interrupted or if the router detects a problem with the
firmware. If the error persists, a hardware problem exists. For recovery instructions, or
help with a hardware problem, contact technical support at
www.netgear.com/support.
Power LED Stays Amber
When the router is powered on, the Power LED lights amber for about 20 seconds and then
lights white. If the LED does not turn white, the router is experiencing a problem.
If the Power LED is still amber one minute after you turn on power to the router, do the
following:
1.
Turn off the power and then turn it back on to see if the router recovers.
2.
Press and hold the
Reset
button to return the router to its factory settings.
See
Factory Settings
on page
178.
If the error persists, you might be experiencing a hardware problem. Contact technical
support at
www.netgear.com/support.
Page 170 / 180
Troubleshooting
170
Nighthawk AC1750
Smart
WiFi
Router
LEDs Never Turn Off
When the router is turned on, the LEDs light for about 10 seconds and then turn off. If all the
LEDs stay on, this indicates a fault within the router.
If all LEDs are still lit one minute after power-up, do the following:
•
Cycle the power to see if the router recovers.
•
Press and hold the
Reset
button to return the router to its factory settings. For more
information, see
Factory Settings
on page
178.
If the error persists, you might be experiencing a hardware problem. 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 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 router’s Internet port to a cable or DSL modem, use the cable that
was supplied with the cable or DSL modem. This cable can be a standard
straight-through Ethernet cable or an Ethernet crossover cable.
WiFi LED Is Off
If the WiFi LED stays off, check to see if the
WiFi On/Off
button on the router was pressed.
This button turns the wireless radios in the router on and off. The WiFi LED is lit when the
wireless radios are turned on.
Cannot Log In to the Router
If you are unable to log in to the 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 router.
•
Make sure that the IP address of your computer is on the same subnet as the router. If
you are using the recommended addressing scheme, your computer’s address is 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
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

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