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Page 86 / 134 Scroll up to view Page 81 - 85
NETGEAR Wireless-N Router WNR2000 User Manual
5-10
Fine-Tuning Your Network
v1.0, June 2008
When port triggering is enabled, the router monitors outbound traffic looking for a specified
outbound “trigger” port. When the router detects outbound traffic on that port, it remembers the IP
address of the local computer that sent the data. The router then temporarily opens the specified
incoming port or ports, and forwards incoming traffic on the triggered ports to the triggering
computer.
While port forwarding creates a static mapping of a port number or range to a single local
computer, port triggering can dynamically open ports to any computer that needs them and can
close the ports when they are no longer needed.
To configure port triggering, you need to know which inbound ports the application needs. Also,
you need to know the number of the outbound port that will trigger the opening of the inbound
ports. You can usually determine this information by contacting the publisher of the application or
user groups or newsgroups.
To set up port triggering:
1.
Select
Port Forwarding/Port Triggering
under Advanced in the main menu. The
Forwarding/Port Triggering screen displays (see
Figure 5-1 on page 5-7
).
2.
Select the
Port Triggering
radio button. The port triggering information displays.
Note:
If you use applications such as multiplayer gaming, peer-to-peer connections, real-
time communications such as instant messaging, or remote assistance (a feature in
Windows XP), you should also enable Universal Plug and Play (UPnP) according
to the instructions in
“Using Universal Plug and Play” on page 5-13
.
Figure 5-4
Page 87 / 134
NETGEAR Wireless-N Router WNR2000 User Manual
Fine-Tuning Your Network
5-11
v1.0, June 2008
3.
Clear the
Disable Port Triggering
check box.
4.
In the
Port Triggering Timeout
field, enter a value up to 9999 minutes. This value controls
the inactivity timer for the designated inbound ports. The inbound ports close when the
inactivity time expires. This is required because the router cannot be sure when the application
has terminated.
5.
Click
Add
. the Port Triggering–Services screen displays.
6.
In the
Service Name
field, enter a descriptive service name.
7.
In the
Service User
field, select
Any
(the default) to allow this service to be used by any
computer on the Internet. Otherwise, select
Single address
, and enter the IP address of one
computer to restrict the service to a particular computer.
8.
Select the service type, either
TCP
or
UDP
.
9.
In the
Triggering Port
field, enter the number of the outbound traffic port that will cause the
inbound ports to be opened.
Note:
If the Disable Port Triggering check box is selected after you configure port
triggering, port triggering is disabled. However, any port triggering
configuration information you added to the router is retained even though it is
not used.
Figure 5-5
Page 88 / 134
NETGEAR Wireless-N Router WNR2000 User Manual
5-12
Fine-Tuning Your Network
v1.0, June 2008
10.
Enter the inbound connection port information in the
Connection Type
,
Starting Port
, and
Ending Port
fields.
11.
Click
Apply
. The service appears in the Port Triggering Portmap table.
Figure 5-6
Page 89 / 134
NETGEAR Wireless-N Router WNR2000 User Manual
Fine-Tuning Your Network
5-13
v1.0, June 2008
Using Universal Plug and Play
Universal Plug and Play (UPnP) helps devices, such as Internet appliances and computers, to
access the network and connect to other devices as needed. UPnP devices can automatically
discover the services from other registered UPnP devices on the network.
To turn on Universal Plug and Play:
1.
Select
UPnP
under Advanced the main menu. The UPnP screen displays.
2.
The available settings and information displayed in this screen are:
•
Turn UPnP On
. UPnP can be enabled or disabled for automatic device configuration. The
default setting for UPnP is disabled. If this check box is not selected, the router does not
allow any device to automatically control the resources, such as port forwarding
(mapping) of the router.
Note:
If you use applications such as multiplayer gaming, peer-to-peer connections, real-
time communications such as instant messaging, or remote assistance (a feature in
Windows XP), you should enable UPnP.
Figure 5-7
Page 90 / 134
NETGEAR Wireless-N Router WNR2000 User Manual
5-14
Fine-Tuning Your Network
v1.0, June 2008
•
Advertisement Period
. The advertisement period is how often the router broadcasts its
UPnP information. This value can range from 1 to 1440 minutes. The default period is 30
minutes. Shorter durations ensure that control points have current device status at the
expense of additional network traffic. Longer durations might compromise the freshness
of the device status but can significantly reduce network traffic.
•
Advertisement Time To Live
. The time to live for the advertisement is measured in hops
(steps) for each UPnP packet sent. The time to live hop count is the number of steps a
broadcast packet is allowed to propagate for each UPnP advertisement before it
disappears. The number of hops can range from 1 to 255. The default value for the
advertisement time to live is 4 hops, which should be fine for most home networks. If you
notice that some devices are not being updated or reached correctly, then it might be
necessary to increase this value.
•
UPnP Portmap Table
. The UPnP Portmap Table displays the IP address of each UPnP
device that is currently accessing the router and which ports (Internal and External) that
device has opened. The UPnP Portmap Table also displays what type of port is open and
whether that port is still active for each IP address.
3.
Click
Apply
to save your settings.
Optimizing Wireless Performance
The speed and operating distance or range of your wireless connection can vary significantly based
on the physical placement of the wireless router. You should choose a location for your router that
will maximize the network speed.
The following list describes how to optimize wireless router performance.
•
Identify critical wireless links.
If your network has several wireless devices, decide which wireless devices need the highest
data rate, and locate the router near them. Many wireless products have automatic data-rate
fallback, which allows increased distances without loss of connectivity. This also means that
devices that are farther away might be slower. Therefore, the most critical links in your
network are those where the traffic is high and the distances are great. Optimize those first.
Note:
Failure to follow these guidelines can result in significant performance degradation
or inability to wirelessly connect to the router. For complete range and
performance specifications, click the link to the online document
“Wireless
Networking Basics” in Appendix B
.

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