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Page 111 / 146 Scroll up to view Page 106 - 110
Advanced Settings
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CENTRIA WNDR4700/WNDR4720
How Port Forwarding Differs from Port Triggering
The following points summarize the differences between port forwarding and port triggering:
•
Port triggering can be used by any computer on your network, although only one
computer can use it at a time.
•
Port forwarding is configured for a single computer on your network.
•
Port triggering does not require that you know the computer’s IP address in advance. The
IP address is captured automatically.
•
Port forwarding requires that you specify the computer’s IP address during configuration,
and the IP address can never change.
•
Port triggering requires specific outbound traffic to open the inbound ports, and the
triggered ports are closed after a period of no activity.
•
Port forwarding is always active and does not need to be triggered.
Set Up Port Forwarding to Local Servers
Using the port forwarding feature, you can allow certain types of incoming traffic to reach
servers on your local network. For example, you might want to make a local web server, FTP
server, or game server visible and available to the Internet.
Use the Port Forwarding screen to configure the router to forward specific incoming protocols
to computers on your local network. In addition to servers for specific applications, you can
also specify a default DMZ server to which all other incoming protocols are forwarded.
Before starting, determine which type of service, application, or game you want to provide.
Find out the local IP address of the computer that will provide the service. The server
computer has to always have the same IP address.
To set up port forwarding:
Tip:
To ensure that your server computer always has the same IP address,
use the reserved IP address feature of your CENTRIA.
1.
Select
Advanced Setup > Port Forwarding/Port Triggering
to display the following
screen:
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Advanced Settings
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CENTRIA WNDR4700/WNDR4720
Port Forwarding is selected as the service type.
2.
From the Service Name list, select the service or game that you will host on your network. If
the service does not appear in the list, see
Add a Custom Service
on page
112.
3.
In the corresponding Server IP Address field, enter the last digit of the IP address of your
local computer that will provide this service.
4.
Click
Add
. The service appears in the list in the screen.
Add a Custom Service
To define a service, game, or application that does not appear in the Service Name list, first
determine which port number or range of numbers the application uses. Usually, you can
determine this information by contacting the publisher of the application or the relevant user
groups or news groups.
To add a custom service:
1.
Select
Advanced > Advanced Setup > Port Forwarding/Port Triggering
.
2.
Select
Port Forwarding
as the service type.
3.
Click the
Add Custom Service
button to display the following screen:
4.
In the Service Name field, enter a descriptive name.
5.
In the Protocol list, select the protocol. If you are unsure, select
TCP/UDP
.
6.
Specify the port settings:
•
External Starting Port
and
External Ending Port
. These are the starting number
and ending number for the public ports at the Internet interface. For single port
forwarding, number in the External Starting Port and External Ending Port fields can
be the same. The range is from 1 to 65534.
•
Use the same port range for Internal port
. This check box is selected by default. If
you want to use different ports, clear this check box and specify the internal ports.
•
Internal Starting Port
and
Internal Ending Port
. These are the starting number and
ending number for the ports of a computer on the router’s local area network (LAN).
These are private ports. The router calculates the internal ending port.
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Advanced Settings
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CENTRIA WNDR4700/WNDR4720
7.
In the Internal IP Address field, enter the IP address of your local computer that will provide
this service.
8.
Click
Apply
. The service appears in the list in the Port Forwarding/Port Triggering screen.
Edit or Delete a Port Forwarding Entry
To edit or delete a port forwarding entry:
1.
In the table, select the radio button next to the service name.
2.
Click
Edit Service
or
Delete Service
.
Application Example: Making a Local Web Server Public
If you host a web server on your local network, you can use port forwarding to allow web
requests from anyone on the Internet to reach your web server.
To make a local web server public:
1.
Assign your web server either a fixed IP address or a dynamic IP address using DHCP
address reservation. In this example, your router always gives your web server an IP
address of 192.168.1.33.
2.
In the Port Forwarding/Port Triggering screen, configure the router to forward the HTTP
service to the local address of your web server at
192.168.1.33
. HTTP (port 80) is the
standard protocol for web servers.
3.
(Optional) Register a host name with a Dynamic DNS service, and configure your router to
use the name as described in
Dynamic DNS
on page
115. To access your web server from
the Internet, a remote user has to know the IP address that your ISP assigned. However, if
you use a Dynamic DNS service, the remote user can reach your server by a user-friendly
Internet name, such as mynetgear.dyndns.org.
Set Up Port Triggering
Port triggering is a dynamic extension of port forwarding that is useful in these cases:
•
More than one local computer needs port forwarding for the same application (but not
simultaneously).
•
An application needs to open incoming ports that are different from the outgoing port.
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.
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.
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Advanced Settings
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CENTRIA WNDR4700/WNDR4720
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
Universal Plug and Play
on page
119.
To configure port triggering, you need to know which inbound ports the application needs,
and the number of the outbound port that will trigger the opening of the inbound ports.
Usually, you can determine this information by contacting the publisher of the application or
the relevant user groups or news groups.
To set up port triggering:
1.
Select
Advanced > Advanced Setup > Port Forwarding/Port Triggering
.
2.
Select the
Port Triggering
radio button to display the port triggering information.
3.
Clear the
Disable Port Triggering
check box if it is selected.
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.
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.
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Advanced Settings
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CENTRIA WNDR4700/WNDR4720
5.
Click
Add Service
to display the following screen:
6.
In the Service Name field, type a descriptive service name.
7.
In the Service User list, 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
or both (
TCP/UDP
). If you are not sure, select
TCP/UDP.
9.
In the Triggering Port field, enter the number of the outbound traffic port that you want to
cause the inbound ports to open.
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.
Dynamic DNS
If your Internet service provider (ISP) gave you a permanently assigned IP address, you can
register a domain name and have that name linked with your IP address by public Domain
Name Servers (DNS). However, if your Internet account uses a dynamically assigned IP
address, you do not know in advance what your IP address will be, and the address can
change frequently. In this case, you can use a commercial Dynamic DNS service. This type
of service lets you register your domain to their IP address and forwards traffic directed at
your domain to your frequently changing IP address.
If your ISP assigns a private WAN IP address (such as 192.168.x.x or 10.x.x.x), the Dynamic
DNS service does not work because private addresses are not routed on the Internet.
Your router contains a client that can connect to the Dynamic DNS service provided by
DynDNS.org. First visit their website at
and obtain an account and
host name that you configure in the router. Then, whenever your ISP-assigned IP address
changes, your router contacts the Dynamic DNS service provider, logs in to your account,
and registers your new IP address. If your host name is hostname, for example, you can
reach your router at
.

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