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Port Forwarding to a Local Server
If your home network includes a server, you can allow certain types of incoming traffic to reach the server. For
example, you might want to make a local web server, FTP server, or game server visible and available to the Internet.
The router can forward incoming traffic with specific protocols to computers on your local network.You can specify
the servers for applications and you can also specify a default DMZ server to which the router forwards all other
incoming protocols.
Set Up Port Forwarding to a Local Server
To forward specific incoming protocols:
1.
Decide which type of service, application, or game you want to provide.
2.
Find the local IP address of the computer on your network that will provide the service.
You can usually find this information by contacting the publisher of the application or user groups or news groups.
The server computer must always use the same IP address.
3.
Assign the server computer a reserved IP address.
See
Manage Reserved LAN IP Addresses
on page 55.
4.
Launch a web browser from a computer or WiFi device that is connected to the network.
5.
Enter
.
A login window opens.
6.
Enter the router 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 page displays.
7.
Select
ADVANCED > Advanced Setup > Port Forwarding/Port Triggering
.
8.
Leave the
Port Forwarding
radio button selected as the service type.
9.
From the
Service Name
menu, select the service name.
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If the service that you want to add is not in the menu, create a custom service. See
Add a Custom Port Forwarding
Service
on page 132.
10.
In the
Server IP Address
field, enter the IP address of the computer that will provide the service.
11.
Click the
Add
button.
The service displays in the menu.
Add a Custom Port Forwarding Service
To add a custom service:
1.
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 news groups.
2.
Launch a web browser from a computer or wireless device that is connected to the network.
3.
Enter
.
A login window opens.
4.
Enter the router 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 page displays.
5.
Select
ADVANCED > Advanced Setup > Port Forwarding/Port Triggering
.
The Port Forwarding/Port Triggering page displays.
6.
Leave the
Port Forwarding
radio button selected as the service type.
7.
Click the
Add Custom Service
button.
8.
In the
Service Name
field, enter a descriptive name.
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9.
From the
Protocol
menu, select the protocol.
If you are unsure, select
TCP/UDP
.
10.
In the
External port range
field, enter the port numbers.
11.
Specify the internal ports by one of these methods:
•
Leave the
Use the same port range for Internal port
check box selected.
•
Type the port numbers in the
Internal Port Range
field.
12.
In the
Internal IP address
field, type the IP addressor select the radio button for an attached device listed in
the table.
13.
Click the
Apply
button.
The service is now in the list on the Port Forwarding/Port Triggering page.
Edit a Port Forwarding Service
To edit a port forwarding entry:
1.
Launch a web browser from a computer or WiFi device that is connected to the network.
2.
Enter
.
A login window opens.
3.
Enter the router 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 page displays.
4.
Select
ADVANCED > Advanced Setup > Port Forwarding/Port Triggering
.
The Port Forwarding/Port Triggering page displays.
5.
Leave the
Port Forwarding
radio button selected as the service type.
6.
In the table, select the radio button next to the service name.
7.
Click the
Edit Service
button.
The Ports - Custom Services page displays.
8.
Change the settings as needed.
9.
Click the
Apply
button.
Your settings are saved.
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Delete a Port Forwarding Entry
To delete a port forwarding entry:
1.
Launch a web browser from a computer or WiFi device that is connected to the network.
2.
Enter
.
A login window opens.
3.
Enter therouter 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 page displays.
4.
Select
ADVANCED > Advanced Setup > Port Forwarding/Port Triggering
.
The Port Forwarding/Port Triggering page displays.
5.
Leave the
Port Forwarding
radio button selected.
6.
In the table, select the radio button next to the service name.
7.
Click the
Delete Service
button.
The service is deleted.
Application Example: Make 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.
On the Port Forwarding/Port Triggering page, 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 specify that name in the Dynamic DNS page
of the router.
Dynamic DNS makes it much easier to access a server from the Internet because you can type the name in the
Internet browser. Otherwise, you must know the IP address that the ISP assigned, which typically changes.
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How the Router Implements the Port Forwarding Rule
The following sequence shows the effects of a port forwarding rule:
1.
When you type the URL www.example.com in your browser, the browser sends a web page request message
with the following destination information:
•
Destination address
. The IP address of www.example.com, which is the address of your router.
•
Destination port number
. 80, which is the standard port number for a web server process.
2.
Your router receives the message and finds your port forwarding rule for incoming port 80 traffic.
3.
The router changes the destination in the message to IP address 192.168.1.123 and sends the message to that
computer.
4.
Your web server at IP address 192.168.1.123 receives the request and sends a reply message to your router.
5.
Your router performs Network Address Translation (NAT) on the source IP address and sends the reply through
the Internet to the computer or WiFi device that sent the web page request.
Port Triggering
Port triggering is a dynamic extension of port forwarding that is useful in these cases:
•
An application must use port forwarding to more than one local computer (but not simultaneously).
•
An application must open incoming ports that are different from the outgoing port.
With port triggering, the router monitors traffic to the Internet from an outbound “trigger” port that you specify. For
outbound traffic from that port, the router saves the IP address of the computer that sent the traffic. The router
temporarily opens the incoming port or ports that you specify in your rule and forwards that incoming traffic to that
destination.
Port forwarding creates a static mapping of a port number or range of ports to a single local computer. Port triggering
can dynamically open ports to any computer when needed and close the ports when they are no longer needed.
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
Improve Network Connections With Universal Plug
and Play
on page 79.
Note
Add a Port Triggering Service
To add a port triggering service:
1.
Launch a web browser from a computer or WiFi device that is connected to the network.
2.
Enter
.
A login window opens.
Customize Internet Traffic Rules for Ports
135
Nighthawk X4S AC2600 Smart WiFi Router

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