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Description
Field
Select the protocol (
TCP
or
UDP
) that is associated with the inbound connection.
If you are unsure, select
TCP/UDP
.
Connection Type
Enter the start port number for the inbound connection.
Starting Port
Enter the end port number for the inbound connection.
Ending Port
8.
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 page.
Change a Port Triggering Rule
You can change an existing port triggering rule.
To change 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.
Manage Port Forwarding and Port Triggering
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5.
Select the
Port Triggering
radio button.
The previous figure shows two port triggering rules.
6.
In the Port Triggering Portmap Table, select the radio button next to the service or application name.
7.
Click the
Edit Service
button.
The Port Triggering - Services page displays.
8.
Change the settings.
For information about the settings, see
Add a Port Triggering Rule
on page 274.
9.
Click the
Apply
button.
Your settings are saved. The changed rule displays in the Port Triggering Portmap Table on the Port Forwarding
/ Port Triggering page.
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 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.
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4.
Select
ADVANCED > Advanced Setup > Port Forwarding / Port Triggering
.
The Port Forwarding / Port Triggering page displays.
5.
Select the
Port Triggering
radio button.
The previous figure shows two port triggering rules.
6.
In the Port Triggering Portmap Table, select the radio button next to the service or application name.
7.
Click the
Delete Service
button.
The rule is removed from the Port Triggering Portmap Table.
Specify the Time-Out 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 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.
The port triggering settings display.
6.
In the
Port Triggering Time-out
field, enter a value up to 9999 minutes.
The default setting is 20 minutes.
7.
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 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.
5.
Select the
Port Triggering
radio button.
The port triggering settings display.
6.
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.
7.
Click the
Apply
button.
Your settings are saved.
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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 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.
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.
Manage Port Forwarding and Port Triggering
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Nighthawk X4S AC2600 WiFi VDSL/ADSL Modem Router Model D7800

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