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Page 181 / 202 Scroll up to view Page 176 - 180
Manage Port Forwarding and Port
Triggering
181
N600 and AC750 WiFi DSL Modem Routers
7.
Click the
Add Service
button.
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 addres
s 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 Port
Enter the number of the outbound traffic port that must open the inbound ports.
Inbound Connection
Connection Type
Select the protocol (
TCP
or
UDP
) that is associated with the inbound connection.
If you are unsure, select
TCP/UDP
.
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 and the rule is added to the Port Triggering Portmap Table on the
Port Forwarding / Port Triggering screen.
Page 182 / 202
Manage Port Forwarding and Port
Triggering
182
N600 and AC750 WiFi DSL Modem Routers
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 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.
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 screen displays.
9.
Change the settings.
Page 183 / 202
Manage Port Forwarding and Port
Triggering
183
N600 and AC750 WiFi DSL Modem Routers
For more information about the settings, see
Add a Port Triggering Rule
on page
180.
10.
Click the
Apply
button.
Your settings are saved. The changed rule displays in the Port Triggering Portmap Table
on the Port Forwarding / Port Triggering screen.
Remove a Port Triggering Rule
You can remove a port triggering rule that you no longer need.
To remove 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.
The following figure shows two port triggering rules.
Page 184 / 202
Manage Port Forwarding and Port
Triggering
184
N600 and AC750 WiFi DSL Modem Routers
7.
In the Port Triggering Portmap Table, select the radio button next to the service or
application name.
8.
Click the
Delete Service
button.
The rule is removed from the Port Triggering Portmap Table.
Specify the Time-Out Period for Port Triggering
The time-out period for port triggering controls how long the inbound ports stay open when
the modem router detects no activity. A time-out period is required because the modem
router cannot detect when the service or application terminates.
To specify the time-out for port triggering:
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.
The port triggering settings display.
7.
In the
Port Triggering Time-out
field, enter a value up to 9999 minutes.
The default setting is 20 minutes.
8.
Click the
Apply
button.
Your settings are saved.
Page 185 / 202
Manage Port Forwarding and Port
Triggering
185
N600 and AC750 WiFi DSL Modem Routers
Disable Port Triggering
By default, port triggering is enabled. You can disable port triggering temporarily without
removing any port triggering rules.
To disable port triggering:
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.
The port triggering settings display.
7.
Clear the
Disable Port Triggering
check box.
If this check box is selected, the modem router does not apply port triggering rules even if
you specified them.
8.
Click the
Apply
button.
Your settings are saved.
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 modem 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
also sends an “identify” message to your computer on port 113. Using port triggering, you can
tell the modem router, “When you initiate a session with destination port 6667, you must also
allow incoming traffic on port 113 to reach the originating computer.”

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