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Configure Advanced Features
121
AC1900, N900, and N450 WiFi
Cable Data Gateways
4.
Your cable data gateway performs Network Address Translation (NAT) on the source IP
address and sends this request message through the Internet to the remote computer,
which displays the web page from www.example.com.
To configure port forwarding, you must know which inbound ports the application needs. You
usually can find this information by contacting the publisher of the application or the relevant
user groups or news groups.
How Port Forwarding Differs from Port Triggering
The following points summarize the differences between port forwarding and port triggering:
•
Any computer on your network can use port triggering, 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 cable data 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 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 Computers
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.
You can configure the cable data 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 you start, determine which type of service, application, or game you want to provide
and the local IP address of the computer that will provide the service. The server computer
must always receive the same IP address.
To ensure that your server computer always receives the same IP address, use the reserved
IP address feature of your product. For more information, see
Manage IP Address
Reservation
on page
49.
To forward specific incoming protocols and enable or schedule port forwarding:
1.
On your computer, launch an Internet browser such as Mozilla Firefox or Microsoft
Internet Explorer.
2.
In the address field of your browser, enter
http://routerlogin.net
.
You are prompted to enter a user name and password.
Page 122 / 168
Configure Advanced Features
122
AC1900, N900, and N450 WiFi
Cable Data Gateways
3.
Type
admin
for the user name and type your password.
If you did not yet personalize your password, type
password
for the password.
4.
Click the
OK
button.
The BASIC Home screen displays.
5.
Select
ADVANCED > Advanced Setup > Port Forwarding / Port Triggering
.
The Port Forwarding / Port Triggering screen displays.
6.
Leave the
Port Forwarding
radio button selected as the service type.
7.
From the
Service Name
menu, select the service or game that you plan to host on your
network.
If the service does not display in the menu, see
Manage Services or Applications for Port
Forwarding
on page
123.
8.
In the
Server IP Address
field, complete the IP address of your local device that must
receive the inbound traffic that is covered by this service.
9.
Click the
Apply
button.
The service or application is added to the Port Forwarding Portmap Table. The
Enable
check box is selected automatically.
10.
In the Port Forwarding section, selects how the cable data gateway applies port forwarding:
•
Per Schedule
. Port forwarding is enabled according the schedule that you must
select from the menu.
For more information, see
Schedule When Features Are Active
on page
68.
•
Always
. Port forwarding is always enabled.
Page 123 / 168
Configure Advanced Features
123
AC1900, N900, and N450 WiFi
Cable Data Gateways
Note:
By default, the
Never
radio button is selected and port forwarding is
disabled, even if you specified services and applications in the table.
11.
Click the
Apply
button.
Your settings are saved.
Manage Services or Applications for Port Forwarding
Before you define a service, game, or application that does not display in the
Service Name
menu on the Port Forwarding / Port Triggering screen, first determine 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 news groups.
Add a Service or Application for Port Forwarding
If the service or application that you want to use for port forwarding is not a default service
that is already included in the menu, you can add it as a custom service.
To add a custom service for port forwarding:
1.
On your computer, launch an Internet browser such as Mozilla Firefox or Microsoft
Internet Explorer.
2.
In the address field of your browser, enter
http://routerlogin.net
.
You are prompted to enter a user name and password.
3.
Type
admin
for the user name and type your password.
If you did not yet personalize your password, type
password
for the password.
4.
Click the
OK
button.
The BASIC Home screen displays.
5.
Select
ADVANCED > Advanced Setup > Port Forwarding/Port Triggering
.
The Port Forwarding / Port Triggering screen displays.
6.
Leave the
Port Forwarding
radio button selected as the service type.
7.
Click the
Add Custom Service
button.
The Ports - Custom Service screen displays.
Page 124 / 168
Configure Advanced Features
124
AC1900, N900, and N450 WiFi
Cable Data Gateways
8.
Specify the custom service or application.
The following table describes the fields on the Ports - Custom Service screen.
Field
Description
Service Name
Enter a descriptive name.
Service Type
From the menu, select the correct type of protocol for the service or application
(
TCP
,
UDP
, or
TCP/UDP
).
Note:
If you are not sure which protocol to select, select
TCP/UDP
.
External Starting Port
Enter the external starting port number for the service or application.
External Ending Port
If the service or application uses a single port, enter the same port number that
you enter in the
External Starting Port
field.
If the service or application uses a range of ports, enter the ending port number of
the range.
Use the same port
range for Internal port
If the service or application uses the same internal ports port numbers that you
specify for the external ports, select the check box.
Internal Starting
Port
If the service or application does not use the same internal ports port numbers that
you specify for the external ports, enter the internal starting port number for the
service or application.
Internal Ending Port
This field is automatically completed when you enter a port number in the
Internal
Starting Port
field.
Page 125 / 168
Configure Advanced Features
125
AC1900, N900, and N450 WiFi
Cable Data Gateways
9.
Click the
Apply
button.
The custom service or application is added to the Port Forwarding Portmap Table. The
Enable
check box is selected automatically.
Change a Service or Application for Port Forwarding
You can change the settings for a default or custom service or application that you use for
port forwarding.
To change the port forwarding settings for a default or custom service or application:
1.
On your computer, launch an Internet browser such as Mozilla Firefox or Microsoft
Internet Explorer.
2.
In the address field of your browser, enter
http://routerlogin.net
.
You are prompted to enter a user name and password.
3.
Type
admin
for the user name and type your password.
If you did not yet personalize your password, type
password
for the password.
4.
Click the
OK
button.
The BASIC Home screen displays.
5.
Select
ADVANCED > Advanced Setup > Port Forwarding / Port Triggering
.
The Port Forwarding / Port Triggering screen displays.
6.
Leave the
Port Forwarding
radio button selected as the service type.
7.
In the table, select the radio button next to the service that you want to change.
8.
Click the
Edit Service
button.
The Ports - Custom Services screen displays.
9.
Change the settings for the service.
For information about the settings, see
Add a Service or Application for Port Forwarding
on page
123.
10.
Click the
Apply
button.
Your settings are saved. The changed settings for the service or application are shown in
the Port Forwarding Portmap Table.
Internal IP address
Complete the IP address of your local device that must receive the inbound traffic
that is covered by this service or application.
External IP address
From the menu, select if either any external IP address can connect to the service
or application or a single IP address only. If you select a single IP address, enter
the IP address.
Field
Description

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