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Page 141 / 157 Scroll up to view Page 136 - 140
Specify Internet Port Settings
141
N900 WiFi Router
The Port Forwarding/Port Triggering screen displays.
5.
Select the
Port Triggering
radio button.
6.
Click the
Add Service
button.
7.
In the
Service Name (If Required)
field, type a descriptive service name.
8.
From the
Service User
list, select a user option:
•
Any
(the default) allows any computer on the Internet to use this service.
•
Single address
restricts the service to a particular computer.
9.
From the
Service Type
list, select
TCP
or
UDP
or
TCP/UDP
(both).
If you are not sure, select
TCP/UDP
.
10.
In the
Triggering Port
field, enter the number of the outbound traffic port that will open the
inbound ports.
11.
In the
Service Type
,
Starting Port
, and
Ending Port
fields, enter the inbound connection
information.
12.
(Optional) 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 router detects no
activity. This value is required because the router cannot detect when the application
terminates.
13.
Click the
Apply
button.
The service is now in the Portmap Table.
Disable Port Triggering
You can disable port triggering. The port triggering services that you set up are saved but are
not used.
To disable port triggering:
1.
Launch a web browser from a computer or wireless device that is connected to the
network.
2.
Type
or
.
A login screen displays.
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Specify Internet Port Settings
142
N900 WiFi Router
3.
Enter the user name and password.
The user name is
admin
. The default password is
password
. The user name and
password are case-sensitive.
The BASIC Home screen displays.
4.
Select
ADVANCED > Advanced Setup > Port Forwarding/Port Triggering
.
The Port Forwarding/Port Triggering screen displays.
5.
Select the
Port Triggering
radio button.
6.
Select the
Disable Port Triggering
check box.
If this check box is selected, the router does not use port triggering even if you specified
port triggering settings.
7.
Click the
Apply
button.
Your settings are saved.
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 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 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
Page 143 / 157
Specify Internet Port Settings
143
N900 WiFi Router
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 144 / 157
144
12
12.
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 145 / 157
Troubleshooting
145
N900 WiFi Router
Quick Tips
This section describes tips for troubleshooting some common problems.
Sequence to Restart Your Network
When you need 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.

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