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Page 176 / 202 Scroll up to view Page 171 - 175
Manage Port Forwarding and Port
Triggering
176
N600 and AC750 WiFi DSL Modem Routers
10.
Click the
Apply
button.
Your settings are saved. The rule is added to the table on the Port Forwarding / Port
Triggering screen.
Change a Port Forwarding Rule
You can change an existing port forwarding rule.
To change a port forwarding rule:
1.
Launch an Internet browser from a computer or WiFi device that is connected to the
network.
2.
Type
.
A login screen displays.
3.
Enter the user name and password for the modem router.
The user name is
admin
. The default password is
password
. The user name and
password are case-sensitive.
4.
Click the
OK
button.
The BASIC Home screen displays.
5.
Select
ADVANCED > Advanced Setup > Port Forwarding / Port Triggering
.
The following figure shows two port forwarding rules.
Internal End Port
Specify the internal end port by one of these methods:
•
Leave the
Use the same port range for Internal port
check box selected.
•
Clear the
Use the same port range for Internal port
check box and enter the
internal end port number that the service or application uses.
Internal IP address
Either enter an IP address in the
Internal IP address
field or select the radio button
for an attached device that is listed in the table.
Field
Description
Page 177 / 202
Manage Port Forwarding and Port
Triggering
177
N600 and AC750 WiFi DSL Modem Routers
6.
Make sure that the
Port Forwarding
radio button is selected.
7.
In the table, select the radio button next to the service or application name.
8.
Click the
Edit Service
button.
The Ports - Custom Services screen displays.
9.
Change the settings.
For more information about the settings, see
Add a Port Forwarding Rule with a Custom
Service or Application
on page
174.
10.
Click the
Apply
button.
Your settings are saved. The changed rule displays in the table on the Port Forwarding /
Port Triggering screen.
Remove a Port Forwarding Rule
You can remove a port forwarding rule that you no longer need.
To remove a port forwarding rule:
1.
Launch an Internet browser from a computer or WiFi device that is connected to the
network.
2.
Type
.
A login screen displays.
3.
Enter the user name and password for the modem router.
The user name is
admin
. The default password is
password
. The user name and
password are case-sensitive.
4.
Click the
OK
button.
Page 178 / 202
Manage Port Forwarding and Port
Triggering
178
N600 and AC750 WiFi DSL Modem Routers
The BASIC Home screen displays.
5.
Select
ADVANCED > Advanced Setup > Port Forwarding / Port Triggering
.
The following figure shows two port forwarding rules.
6.
Make sure that the
Port Forwarding
radio button is selected.
7.
In the table, select the radio button next to the service or application name.
8.
Click the
Delete Service
button.
The rule is removed from the table.
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 modem router always gives your web server an IP address of
192.168.1.55.
2.
On the Port Forwarding / Port Triggering screen, configure the modem router to forward the
HTTP service to the local address of your web server at
192.168.1.55
.
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 on the
Dynamic DNS screen of the modem router.
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Manage Port Forwarding and Port
Triggering
179
N600 and AC750 WiFi DSL Modem Routers
Dynamic DNS makes it much easier to access a server from the Internet because you
can enter the name in the Internet browser. Otherwise, you must know the IP address
that the ISP assigned, which typically changes.
How the Modem Router Implements the Port Forwarding Rule
The following sequence shows the effects of a port forwarding rule:
1.
When you enter 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 modem router.
•
Destination port number
. 80, which is the standard port number for a web server
process.
2.
The modem router receives the message and finds your port forwarding rule for incoming
port 80 traffic.
3.
The modem 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 modem router.
5.
Your modem 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.
Manage Port Triggering for Services and Applications
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 modem router monitors traffic to the Internet from an outbound
“trigger” port that you specify. For outbound traffic from that port, the modem router saves the
IP address of the computer that sent the traffic. The modem 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.
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Manage Port Forwarding and Port
Triggering
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N600 and AC750 WiFi DSL Modem Routers
Note:
If you use applications such as multiplayer gaming, peer-to-peer
connections, real-time communications such as instant messaging, or
remote assistance, enable Universal Plug and Play (UPnP). See
Improve
Network Connections with Universal Plug and Play
on page
148.
Add a Port Triggering Rule
The modem router does not provide default services and applications for port triggering rules.
You must define a custom service or application for each port triggering rule.
To add a port triggering rule:
1.
Launch an Internet browser from a computer or WiFi device that is connected to the
network.
2.
Type
.
A login screen displays.
3.
Enter the user name and password for the modem router.
The user name is
admin
. The default password is
password
. The user name and
password are case-sensitive.
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.
Select the
Port Triggering
radio button.

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