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Chapter 5 Network Tab
Port Trigger Check the Enable box to use the port trigger function. Due to the existence
of the firewall, some applications such as online games, video conferences,
VoIPs and P2P downloads need the device to configure the forwarding to
work properly, and these applications require multiple ports connection, for
single-port virtual server cannot meet the demand. Port trigger function
comes at this time. When an application initiates a connection to the trigger
port, all the incoming ports will open for subsequent connections.
Once configured, operation is as follows:
A local host makes an outgoing connection to an external host using a
destination port number defined in the
Trigger Port
field.
The router records this connection, opens the incoming port or ports
associated with this entry in the Port Triggering table, and associates them
with the local host.
When necessary the external host will be able to connect to the local host
using one of the ports defined in the
Incoming Port
field.
To use the port trigger:
Click Add in the table of Port Trigger.
Enter the
Incoming Port
for incoming traffic. The port or port range is used
by the remote system when it responds to the outgoing request. A
response to one of these ports will be forwarded to the PC that triggered
this rule. You can input at most 5 groups of ports (or port section). Every
group of ports must be set apart with ",". For example, 2000-2038, 2050-
2051, 2085, 3010-3030.
Enter the
trigger port
for outgoing traffic. An outgoing connection using
this port will "Trigger" this rule.
Choose the one of the protocols used for this application: TCP, UDP, or
TCP/UDP.
Click Save after finishing the configuration.
Select the added entries, you can edit or delete them.
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