NETGEAR FVS318N manual Configure Port Triggering,  To add a port triggering rule, 190

ProSafe Wireless-N 8-Port Gigabit VPN Firewall FVS318N

Configure 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 the port triggering feature requires that you know the port numbers used by the application.

Note: Port triggering is supported for IPv4 devices only.

Once configured, port triggering operates as follows:

1.A computer makes an outgoing connection using a port number that is defined in the Port Triggering Rules table.

2.The wireless VPN firewall records this connection, opens the additional incoming port or ports that are associated with the rule in the port triggering table, and associates them with the computer.

3.The remote system receives the computer’s request and responds using the incoming port or ports that are associated with the rule in the port triggering table on the wireless VPN firewall.

4.The wireless VPN firewall matches the response to the previous request and forwards the response to the computer.

Without port triggering, the response from the external application would be treated as a new connection request rather than a response to a request from the LAN network. As such, it would be handled in accordance with the inbound port forwarding rules, and most likely would be blocked.

Note these restrictions on port triggering:

•Only one computer can use a port triggering application at any time.

•After a computer has finished using a port triggering application, there is a short time-out period before the application can be used by another computer. This time-out period is required so the wireless VPN firewall can determine that the application has terminated.

Note: For additional ways of allowing inbound traffic, see Inbound Rules

(Port Forwarding) on page 133.

To add a port triggering rule:

1.Select Security > Port Triggering. The Port Triggering screen displays. (The following figure shows a rule in the Port Triggering Rules table as an example.)

Firewall Protection

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