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Figure 4-30 Port Triggering

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.

¾ Trigger Port - The port for outgoing traffic. An outgoing connection using this port will

"Trigger" this rule.

¾ Trigger Protocol - The protocol used for Trigger Ports, TCP, UDP, or All (all protocols

supported by the router).

¾ 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.

¾ Incoming Protocol - The protocol used for Incoming Ports Range, TCP , UDP, or ALL (all

protocols supported by the router).

¾ 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 4-31)

Select a common application from the Commom Applications drop-list then the port

parameters will be automatically filled in the corresponding field. If the Common Applicatins

list does not have the application you want, type the port parameters manually.

3. Select the protocol used for Trigger Port and Incoming Ports from the corresponding

pull-down list.

4. Select the Enable option in the Status pull-down list..

5. Click the Save button to save the new rule.