NETGEAR ProSafe DGFV338 Reference Manual page 101

DGFV338 ProSafe Wireless ADSL Modem VPN Firewall Router Reference Manual
was made. When the application ceases to transmit data over the port, the router waits for a
timeout interval and then closes the port or range of ports, making them available to other
computers on the private network.
Once configured, the operation is as follows:
• A PC makes an outgoing connection using a port number defined in the Outgoing Port
Triggering table.
• The ProSafe DGFV338 records this connection, opens the incoming port or ports associated
with this entry in the Incoming Port Triggering table, and associates them with the PC.
• The remote system receives the PCs request and responds using the different port numbers that
you have now opened.
• This Router 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 Port Forwarding rules.
• Only one PC can use a Port Triggering application at any time.
• After a PC has finished using a Port Triggering application, there is a Time-out period before
the application can be used by another PC. This is required because this Router cannot be sure
when the application has terminated.
Note: For additional ways of allowing inbound traffic, see
Forwarding)" on page
To add a new port triggering rule:
1. Select Security from the main menu and Port Triggering from the submenu. The Port
Triggering screen will display.
2. Enter the following data in the Add Port Triggering Rule fields:
a. Name – Enter a suitable name for this rule (for example, the name of the application)
b. Enable/Disable – Select the desired option from the pull-down menu.
c. Outgoing (Trigger) Port Range – Enter the range of port numbers used by the application
on the private network when it generates an outgoing request.
d. Incoming (Response) Port Range – Enter the range of port numbers used by the remote
system when it responds to the PC's request.
Security and Firewall Protection
4-7.
v1.0, April 2007
"Inbound Rules (Port
4-29