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Page 271 / 292 Scroll up to view Page 266 - 270
Manage Port Forwarding and Port Triggering
271
AC1600 WiFi VDSL/ADSL Modem Router Model D6400
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.
For more information about the settings, see
Add a Port Triggering Rule
on page
268.
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.
Disable or Remove a Port Triggering Rule
You can disable or remove a port triggering rule that you no longer need.
To disable or 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.
Page 272 / 292
Manage Port Forwarding and Port Triggering
272
AC1600 WiFi VDSL/ADSL Modem Router Model D6400
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.
To disable the rule, do the following:
a.
In the Enable column of the Port Triggering Portmap Table, clear the check box next
to the service or application name.
b.
Click the
Apply
button.
Your settings are saved.
8.
To remove the rule entirely, do the following:
a.
In the Port Triggering Portmap Table, select the radio button next to the service or
application name.
b.
Click the
Delete Service
button.
The rule is removed from the Port Triggering Portmap Table.
Page 273 / 292
Manage Port Forwarding and Port Triggering
273
AC1600 WiFi VDSL/ADSL Modem Router Model D6400
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.
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.
Page 274 / 292
Manage Port Forwarding and Port Triggering
274
AC1600 WiFi VDSL/ADSL Modem Router Model D6400
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.
Select 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.”
The following sequence shows the effects of this port triggering rule:
1.
You open an IRC client program to start a chat session on your computer.
2.
Your IRC client composes a request message to an IRC server using a destination port
number of 6667, the standard port number for an IRC server process. Your computer then
sends this request message to your modem router.
3.
Your modem router creates an entry in its internal session table describing this
communication session between your computer and the IRC server. Your modem router
stores the original information, performs Network Address Translation (NAT) on the source
address and port, and sends this request message through the Internet to the IRC server.
4.
Noting your port triggering rule and observing the destination port number of 6667, your
modem router creates another session entry to send any incoming port 113 traffic to your
computer.
5.
The IRC server sends a return message to your modem router using the NAT-assigned
source port (for example, port 33333) as the destination port and the IRC server also sends
an “identify” message to your modem router with destination port 113.
6.
When your modem router receives the incoming message to destination port 33333, it
checks its session table to see if a session is active for port number 33333. Finding an active
session, the modem router restores the original address information replaced by NAT and
sends this reply message to your computer.
Page 275 / 292
Manage Port Forwarding and Port Triggering
275
AC1600 WiFi VDSL/ADSL Modem Router Model D6400
7.
When your modem router receives the incoming message to destination port 113, it checks
its session table and finds an active session for port 113 associated with your computer. The
modem router replaces the message’s destination IP address with your computer’s IP
address and forwards the message to your computer.
8.
When you finish your chat session, your modem router eventually senses a period of
inactivity in the communications. The modem router then removes the session information
from its session table, and incoming traffic is no longer accepted on port numbers 33333 or
113.

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