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4.9.2 Port Triggering
Some applications require multiple connections, like Internet games, video conferencing, Internet
calling and so on. These applications cannot work with a pure NAT router. Port Triggering is
used for some of these applications that can work with a NAT router. You can set up Port
Triggering on this page shown in Figure 4-31:
Once configured, operation is as follows:
1. A local host makes an outgoing connection to an external host using a destination port
number defined in the Trigger Port field.
2. 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.
3. When necessary the external host will be able to connect to the local host using one of the
ports defined in the Incoming Ports field.
Trigger Port - The port for outgoing traffic. An outgoing connection using this port will
"Trigger" this rule.
Trigger Protocol - The protocol used for Trigger Ports, TCP, UDP, or All (all protocols
supported by the router).
Incoming Ports Range - The port or port range used by the remote system when it
responds to the outgoing request. A response using 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.
Incoming Protocol - The protocol used for Incoming Ports Range, TCP , UDP, or ALL (all
protocols supported by the router).
Status - The status of this entry is either Enabled or Disabled.
To add a new rule, please take the following steps:
1.
Click the Add New... in Port Triggering page.. (pop-up Figure 4-32)
2.
Enter a port number used by the application to send an outgoing request in the Trigger Port
box.
3.
Select the protocol used for Trigger Port from the pull-down list of Trigger Protocol, TCP,
UDP, or All.
4.
Enter the range of port numbers used by the remote system when it responds to the PC's
request in the Incoming Ports box.
5.
Select the protocol used for Incoming Ports Range from the pull-down list, TCP , UDP, or
All.
6.
Select the Enable option in the Status pull-down list..
Figure 4-31 Port Triggering
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