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Page 91 / 101 Scroll up to view Page 86 - 90
Specify Internet Port Settings
91
N600 WiFi Cable Modem Router Model C3700
5.
Select the
Port Triggering
radio button.
6.
Select a radio button to specify when you want to use port triggering:
•
Never
. The modem router does not use port triggering even if you have specified port
triggering settings.
•
Per Schedule
. Port triggering is used based on the settings in the Schedule screen.
•
Always
. Always use port triggering.
7.
In the
Port Triggering Timeout
field, enter a value up to 9999 minutes.
This value controls how long the inbound ports stay open when the modem router detects
no activity. This value is required because the modem router cannot detect when the
application terminates.
Application Example: Port Triggering for Internet Relay Chat
Some application servers, such as FTP and IRC servers, send replies to multiple port
numbers. Using port triggering, you can tell the modem router to open more incoming ports
when a particular outgoing port starts a session.
An example is Internet Relay Chat (IRC). Your computer connects to an IRC server at
destination port 6667. The IRC server not only responds to your originating source port, but
also sends an “identify” message to your computer on port 113. Using port triggering, you can
tell the modem 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 the port triggering rule you have defined:
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.
Page 92 / 101
Specify Internet Port Settings
92
N600 WiFi Cable Modem Router Model C3700
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. 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 93 / 101
93
9
9.
Troubleshooting
This chapter gives information about troubleshooting your modem router.
This chapter includes the following sections:
•
Use LEDs to Troubleshoot
•
Cannot Log In to the Modem Router
•
Cannot Log In to the Modem Router
•
Troubleshoot a TCP/IP Network Using a Ping Utility
Tip:
NETGEAR provides helpful articles, documentation, and the latest
software updates at
support.netgear.com
.
Page 94 / 101
Troubleshooting
94
N600 WiFi Cable Modem Router Model C3700
Use LEDs to Troubleshoot
The following table provides help when using the LEDs for troubleshooting.
Table 3.
LED troubleshooting
LED Behavior
Action
All LEDS are off when the modem
router is plugged in.
Make sure that the power cord is properly connected to your modem
router and that the power adapter is properly connected to a
functioning power outlet.
Check that you are using the 12 VDC power adapter from NETGEAR
for this product.
If the error persists, you have a hardware problem. Contact technical
support.
All LEDs stay on.
•
Clear the configuration of the modem router to its factory defaults.
This operation sets the IP address of the modem router to
192.168.0.1. See
Factory Default Settings
on page
99.
•
If the error persists, you have a hardware problem. Contact
technical support.
LAN LED is off for a port with an
Ethernet connection.
•
Make sure that the Ethernet cable connections are secure at the
modem router and at the hub or computer.
•
Make sure that power is turned on to the connected hub or
computer.
•
Be sure that you are using the correct cable.
Internet LED is off and the modem
router is connected to the cable
television cable.
•
Make sure that the coaxial cable connections are secure at the
modem router and at the wall jack.
•
Make sure that your cable service provider has provisioned your
cable Internet service. Your provider can verify that the signal
quality is good enough for modem router service.
•
Remove any excessive splitters that you have on your cable line.
Run a “home run” back to the point where the cable enters your
home.
Cannot Log In to the Modem Router
If you cannot access the modem router from a computer on your local network, check the
following:
•
If you are using a WiFi connection, check to make sure that your computer or mobile
device is connected to the correct WiFi network.
•
If your computer is connected to the modem router wtih an Ethernet cable, check the
connection.
•
Make sure that your computer’s IP address is on the same subnet as the modem router.
If you are using the recommended addressing scheme, the address of your computer is
in the range of 192.168.0.10 to 192.168.0.254.
Page 95 / 101
Troubleshooting
95
N600 WiFi Cable Modem Router Model C3700
Note:
If the IP address of your computer is shown as 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. 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 the IP address of your modem router has been changed and you do not know its
current IP address, clear the configuration of the modem router to its factory defaults.
This sets the IP address of the modem router to 192.168.0.1. For more information, see
Factory Default Settings
on page
99.
•
Make sure that your browser has Java, JavaScript, or ActiveX enabled. If you are using
Internet Explorer, click the
Refresh
button to make 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 modem router user name
admin
is lowercase (Caps Lock is off). The default password is
password
.
If the modem router does not save changes you have made, do the following:
•
When entering configuration settings, be sure to click the
Apply
button before moving to
another screen, or your changes are lost.
•
Click the
Refresh
or
Reload
button in the web browser. The changes have occurred, but
the web browser might be caching the old configuration.
Troubleshoot the ISP Connection
When your modem router cannot access the Internet and your Internet LED is on, register
the cable MAC address or device MAC address of your modem router with your cable service
provider.
Additionally, your computer might not have the modem router configured as its TCP/IP
gateway. If your computer obtains its information from the modem router by DHCP, reboot the
computer and verify the gateway address.
Troubleshoot a TCP/IP Network Using a Ping Utility
Most TCP/IP terminal 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 TCP/IP network by using the ping utility in your computer or
workstation.

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