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Page 161 / 180 Scroll up to view Page 156 - 160
Specify Internet Port Settings
161
Nighthawk AC1750
Smart
WiFi
Router
11.
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.
12.
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 Starting Port
and
Internal Ending Port
fields.
13.
In the
Internal IP address
field, type the IP address or select the radio button for an
attached device listed in the table.
14.
Click the
Apply
button.
The service is now in the list on the Port Forwarding/Port Triggering screen.
Edit a Port Forwarding Service
To edit a port forwarding entry:
1.
Launch an Internet browser from a computer or wireless device that is connected to the
network.
2.
Type
or
.
A login screen displays.
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 screen displays.
4.
Select
ADVANCED > Advanced Setup > Port Forwarding/Port Triggering
.
The Port Forwarding/Port Triggering screen 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 screen displays.
8.
Change the settings as needed.
9.
Click the
Apply
button.
Your changes are saved.
Page 162 / 180
Specify Internet Port Settings
162
Nighthawk AC1750
Smart
WiFi
Router
Delete a Port Forwarding Entry
To delete a port forwarding entry:
1.
Launch an Internet browser from a computer or wireless device that is connected to the
network.
2.
Type
or
.
A login screen displays.
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 screen displays.
4.
Select
ADVANCED > Advanced Setup > Port Forwarding/Port Triggering
.
The Port Forwarding/Port Triggering screen displays.
5.
Select the
Port Forwarding
radio button as the service type.
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.
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 specify that name in the
Dynamic DNS screen 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.
How the Router Implements the Port Forwarding Rule
The following sequence shows the effects of a port forwarding rule:
Page 163 / 180
Specify Internet Port Settings
163
Nighthawk AC1750
Smart
WiFi
Router
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 wireless device that sent the web
page request.
Set Up 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.
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
Improve Network Connections with Universal
Plug and Play
on page
53.
Add a Port Triggering Service
To add a port triggering service:
1.
Launch an Internet browser from a computer or wireless device that is connected to the
network.
Page 164 / 180
Specify Internet Port Settings
164
Nighthawk AC1750
Smart
WiFi
Router
2.
Type
or
.
A login screen displays.
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 screen displays.
4.
Select
ADVANCED > Advanced Setup > Port Forwarding/Port Triggering
.
The Port Forwarding/Port Triggering screen displays.
5.
Select the
Port Triggering
radio button.
6.
Click the
Add Service
button.
7.
In the
Service Name
field, type a descriptive service name.
8.
From the
Service User
list, select a user option:
•
Any
(the default) allows any computer on the Internet to use this service.
•
Single address
restricts the service to a particular computer.
9.
From the
Service Type
list, select
TCP
or
UDP
or
TCP/UDP
(both).
If you are not sure, select
TCP/UDP
.
10.
In the
Triggering Port
field, enter the number of the outbound traffic port that will open the
inbound ports.
11.
In the
Connection Type
,
Starting Port
, and
Ending Port
fields, enter the inbound
connection port information.
12.
Click the
Apply
button.
The service is added. You must enable port triggering before the router uses port
triggering for the service that you added. See
Enable Port Triggering
on page
165.
Page 165 / 180
Specify Internet Port Settings
165
Nighthawk AC1750
Smart
WiFi
Router
Enable Port Triggering
To enable port triggering:
1.
Launch an Internet browser from a computer or wireless device that is connected to the
network.
2.
Type
or
.
A login screen displays.
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 screen displays.
4.
Select
ADVANCED > Advanced Setup > Port Forwarding/Port Triggering
.
The Port Forwarding/Port Triggering screen displays.
5.
Select the
Port Triggering
radio button.
6.
Clear the
Disable Port Triggering
check box.
If this check box is selected, the router does not use port triggering even if you have
specified port triggering settings.
7.
In the
Port Triggering Timeout
field, enter a value up to 9999 minutes.
This value controls how long the inbound ports stay open when the router detects no
activity. This value is required because the router cannot detect when the application
terminates.
Application Example: Port Triggering for Internet Relay Chat
Some application servers, such as FTP and IRC servers, send replies to multiple port
numbers. Using port triggering, you can tell the router to open more incoming ports when a
particular outgoing port starts a session.
An example is Internet Relay Chat (IRC). Your computer connects to an IRC server at
destination port 6667. The IRC server not only responds to your originating source port, but

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