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Page 171 / 198 Scroll up to view Page 166 - 170
Manage Port Forwarding and Port Triggering
171
AC1600 WiFi Cable Modem Router
4.
Click the
OK
button.
The BASIC Home page 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 page, 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.
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AC1600 WiFi Cable Modem Router
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 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, Applications, and
Games
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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AC1600 WiFi Cable Modem Router
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
Manage Universal Plug and Play
on page
92.
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 window opens.
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 page displays.
5.
Select
ADVANCED > Advanced Setup > Port Forwarding / Port Triggering
.
The Port Forwarding / Port Triggering page displays.
6.
Select the
Port Triggering
radio button.
7.
Click the
Add Service
button.
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AC1600 WiFi Cable Modem Router
8.
Specify a new port triggering rule with a custom service or application as described in the
following table.
Field
Description
Service Name
Enter the name of the custom service or application.
Service User
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 Type
Select the protocol (
TCP
or
UDP
) that is associated with the service or
application.
Triggering Starting Port
Enter the number of the outbound traffic start port that must open the inbound
ports.
Triggering Ending Port
Enter the number of the outbound traffic end port that must open the inbound
ports.
Inbound Connection
Starting Port
Enter the start port number for the inbound connection.
Ending Port
Enter the end port number for the inbound connection.
9.
Click the
Apply
button.
Your settings are saved. The rule is added to the Port Triggering Portmap Table on the
Port Forwarding / Port Triggering page and is enabled.
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AC1600 WiFi Cable Modem Router
Change a Port Triggering Rule
You can change an existing port triggering rule.
To change 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 window opens.
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 page displays.
5.
Select
ADVANCED > Advanced Setup > Port Forwarding / Port Triggering
.
The Port Forwarding / Port Triggering page displays.
6.
Select the
Port Triggering
radio button.
The following figure shows two port triggering rules.
7.
In the Port Triggering Portmap Table, select the radio button next to the service or
application name.
8.
Click the
Edit Service
button.
The Port Triggering - Services page displays.
9.
Change the settings.

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