Netgear Modem FVS318N User Manual download pdf (Page 190)

Firewall Protection

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 make

s an outgoing connection using a port number that is defined in the

Port Triggering Rules table.

2. Th

e 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. Th

e 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:

• On

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

• Af

ter 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 Secu

rity > Port Triggering. The Port Triggering screen displays. (The following

figure shows a rule in the Port Triggering Rules table as an example.)

1 2 ... 185 186 187 188 189 190 191 192 193 194 195 ... 424 425

No comments

Netgear Modem FVS318N User Manual Page 190