Table of ContentsPreviousNextIndexSearch Knowledge Base

Complete PDF manual
PDF of this chapter


Port Triggering

Port triggering allows some applications running on a LAN network to be available to external applications that would otherwise be partially blocked by the firewall. Using this feature requires that you know the port numbers used by the application.

Once configured, port triggering operates as follows:

  1. A PC makes an outgoing connection using a port number defined in the Port Triggering table.
  2. The VPN firewall records this connection, opens the additional INCOMING port or ports associated with this entry in the Port Triggering table, and associates them with the PC.
  3. The remote system receives the PC's request and responds using the different port numbers that you have now opened.
  4. The VPN firewall matches the response to the previous request, and forwards the response to the PC.

Without Port Triggering, this response would be treated as a new connection request rather than a response. As such, it would be handled in accordance with the inbound service rules.

Note these restrictions with Port Triggering:

To add a port triggering rule:

  1. Select Security > Port Triggering from the main menu. The Port Triggering screen is displayed..

    Figure 4-12

  2. Enter a user-defined name for this rule in the Name field.
  3. From the Enable pull-down menu, indicate if the rule is enabled or disabled.
  4. From the Protocol pull-down menu, choose either TCP or UDP transport protocol.
  5. In the Outgoing (Trigger) Port Range fields:
    1. Enter the Start Port range (1 - 65534).
    2. Enter the End Port range (1 - 65534).
  6. In the Incoming (Response) Port Range fields:
    1. Enter the Start Port range (1 - 65534).
    2. Enter the End Port range (1 - 65534).
  7. Click Add. The port triggering rule will be added to the Port Triggering Rules table.

To check the status of the port triggering rules, click the Status option arrow to the right of the tab on the Port Triggering screen.


NETGEAR, Inc.
http://www.netgear.com
Table of ContentsPreviousNextIndexSearch Knowledge Base