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Change a Port Forwarding Rule
You can change an existing port forwarding rule.
To change a port forwarding rule:
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 modem 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 previous figure shows two custom port forwarding rules.
5.
Make sure that the
Port Forwarding
radio button is selected.
6.
In the table, select the radio button next to the service or application name.
7.
Click the
Edit Service
button.
The Ports - Custom Services page displays.
8.
Change the settings.
For information about the settings, see
Add a Port Forwarding Rule With a Custom Service or Application
on
page 269.
9.
Click the
Apply
button.
Your settings are saved. The changed rule displays in the table on the Port Forwarding / Port Triggering page.
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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 a web browser from a computer or WiFi device that is connected to the network.
2.
Enter
.
A login window opens.
3.
Enter the modem 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 previous figure shows two custom port forwarding rules.
5.
Make sure that the
Port Forwarding
radio button is selected.
6.
In the table, select the radio button next to the service or application name.
7.
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.
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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 modem 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 on the Dynamic DNS page
of the modem router.
Dynamic DNS makes it much easier to access a server from the Internet because you can enter the name in
the web 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 router changes the destination IP address in the message to 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 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
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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.
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 146.
Note
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 a web browser from a computer or WiFi device that is connected to the network.
2.
Enter
.
A login window opens.
3.
Enter the modem 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.
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5.
Select the
Port Triggering
radio button.
6.
Click the
Add Service
button.
7.
Specify a new port triggering rule with a custom service or application as described in the following table.
Description
Field
Enter the name of the custom service or application.
Service Name
From the
Service User
menu, select
Any
, or select
Single address
and enter the IP address
of one computer:
•
Any
.This is the default setting and allows any computer on the Internet to use this service.
•
Single address
. Restricts the service to a particular computer.
Service User
Select the protocol (
TCP
or
UDP
) that is associated with the service or application.
Service Type
Enter the number of the outbound traffic port that must open the inbound ports.
Triggering Port
Inbound Connection
Manage Port Forwarding and Port Triggering
275
Nighthawk X4S AC2600 WiFi VDSL/ADSL Modem Router Model D7800

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