TL-R460 Cable/DSL Router User Guide
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on the next screen (shown in Figure 4-24).
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 an NAT router.
Figure 4-24
¾ Trigger Port - This displays the port for outgoing traffic. An outgoing connection
using this port will "Trigger" this rule.
¾ Trigger Protocol - This displays the protocol used for Trigger Ports, either TCP,
UDP, or All (all protocols supported by the router).
¾ Incoming Ports - This displays the port or port range used by the remote system,
they are used for responding 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 apart with ",".
For example, 2000-2038, 2050-2051, 2085, 3010-3030.
¾ Incoming Protocol - This displays the protocol used for Incoming Ports Range,
either TCP or UDP, or ALL (all protocols supported by the router).
¾ Status - This displays the status. Enabled means that the rule will take effect,
Disabled means that the rule will not take effect.
Once configured, the operation for Port Triggering will proceed as follows:
Step 1: A local host makes an outgoing connection using a destination port number
defined in the Trigger Port field.
Step 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.
Step 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.
To add/modify a port triggering entry:
Step 1: Click Add New…/Modify shown in Figure 4-24, you will see a new screen
shown in Figure 4-25.
