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Advanced Settings
56
Wireless Cable Voice Gateway CG3700EMR-1CMNDS
•
Port triggering is 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.
•
With port triggering, the gateway does not need to know the computer’s IP address in
advance. The IP address is captured automatically.
•
Port forwarding requires that you specify the computer’s UP address during configuration,
and the UP 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 is never 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 want to make a local web server, FTP
server, or game server visible and available to the Internet.
Use the Port Forwarding/Port Triggering screen to configure the gateway 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, you determine which type of service, application, or game you want to
provide, and the local IP address of the computer that provides the service. The server
computer always must have the same IP address.
Tip:
To ensure that your server computer always has the same IP address,
use the reserved IP address feature of your wireless cable gateway.
To set up port forwarding:
1.
Select
ADVANCED >
Advanced Setup > Port Forwarding/Port Triggering
.
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Advanced Settings
57
Wireless Cable Voice Gateway CG3700EMR-1CMNDS
The following screen displays:
Port Forwarding is selected as the service type.
2.
From the Service Name list, select the service or game that you host on your network. If the
service does not display in the list, see
Add a Custom Service
on page
57.
3.
In the Server IP Address field, enter the last digit of the IP address of your local computer
that provides this service.
4.
Click the
Add
button.
The service displays in the list.
Add a Custom Service
To define a service, game, or application that does not display in the Service Name list, find
out which port number or range of numbers the application uses. You can usually find this
information by contacting the publisher of the application or user groups or newsgroups.
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.
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Advanced Settings
58
Wireless Cable Voice Gateway CG3700EMR-1CMNDS
The following screen displays:
4.
In the Service Name field, enter a descriptive name.
5.
In the Service Type list, select the protocol. If you are unsure, select
TCP/UDP
.
6.
In the External Starting Port fields, enter the beginning port number of the outside device.
•
If the application uses a single port, enter the same port number in the External
Ending Port field.
•
If the application uses a range of ports, enter the ending port number of the range in
the External Ending Port field.
7.
In the Internal Starting Port fields, enter the beginning port number of the internal LAN
device.
•
If the application uses a single port, enter the same port number in the Internal Ending
Port field.
•
If the application uses a range of ports, enter the ending port number of the range in
the Internal Ending Port field.
8.
In the Internal IP Address field, enter the IP address of your local computer that provides this
service.
9.
In the External IP Address field, select
Any
(the default) to allow any device access, or enter
the IP address of the outside device.
10.
Click the
Apply
button.
The service displays in the list in the Port Forwarding/Port Triggering screen.
Edit a Port Forwarding Entry
To edit a port forwarding entry:
1.
Select
ADVANCED > Advanced Setup > Port Forwarding/Port Triggering
.
2.
Click the
Edit Service
button.
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Advanced Settings
59
Wireless Cable Voice Gateway CG3700EMR-1CMNDS
3.
Select the radio button next to the service name.
4.
Make the necessary changes.
5.
Click the
Apply
button.
Delete a Port Forwarding Entry
To delete a port forwarding entry:
1.
Select
ADVANCED > Advanced Setup > Port Forwarding/Port Triggering
.
2.
Click the
Delete Service
button.
3.
Select the radio button next to the service name.
4.
Click the
Apply
button.
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 gateway always gives your web server an IP
address of 192.168.0.33.
2.
In the Port Forwarding/Port Triggering screen, configure the gateway to forward the HTTP
service to the local address of your web server at
192.168.0.33
. HTTP (port 80) is the
standard protocol for web servers.
3.
(Optional) Register a host name with a Dynamic DNS service, and configure your gateway
to use the name.
For more information, see
Dynamic DNS
on page
61. To access your web server from
the Internet, a remote user must know the IP address that your ISP assigns. 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 opens incoming ports that are different from the outgoing port.
When port triggering is enabled, the gateway monitors outbound traffic looking for a specified
outbound “trigger” port. When the gateway detects outbound traffic on that port, it remembers
the IP address of the local computer that sent the data. The gateway then temporarily opens
the specified incoming port or ports, and forwards incoming traffic on the triggered ports to
the triggering computer.
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Advanced Settings
60
Wireless Cable Voice Gateway CG3700EMR-1CMNDS
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.
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), enable Universal
Plug and Play (UPnP). See
Remote Management
on page
63.
To set up port triggering, you must know which inbound ports the application needs. Also,
you must know the number of the outbound port that triggers the opening of the inbound
ports. You can usually find this information by contacting the publisher of the application or
user groups or newsgroups.
To set up port triggering:
1.
Select
ADVANCED >
Advanced Setup > Port Forwarding/Port Triggering
.
2.
Select the
Port Triggering
radio button.
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 gateway is retained even though it
is not used.
4.
In the Port Triggering Time-out 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 step is required because the gateway
cannot be sure when the application has terminated.

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