Tp-Link TL-R600VPN [37/82] Port triggering

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Gigabit Broadband VPN Router User GuideTL-R600VPN

4.5.2 Port Triggering

Choose menu “Forwarding→Port Triggering”, you can view and add port triggering in the next

screen (shown in Figure 4-20).

Some applications require multiple connections, like Internet games, video conferencing, Internet

calling and so on. These applications cannot work with a pure NAT router. Port Triggering is used

for some of these applications that can work with an NAT router.

Figure 4-20

¾ Trigger Port - This displays the port for outgoing traffic. An outgoing connection using this

port will "Trigger" this rule.

¾ Trigger Protocol - This displays the protocol used for Trigger Ports, either TCP, UDP, or All

(all protocols supported by the router).

¾ Incoming Port - This displays the port or port range used by the remote system, they are

used for responding 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 apart with ",". For example, 2000-2038, 2050-2051,

2085, 3010-3030.

¾ Incoming Protocol - This displays the protocol used for Incoming Ports Range, either TCP,

UDP, or ALL (all protocols supported by the router).

¾ Status - This displays the status. Enabled means that the rule will take effect, Disabled

means that the rule will not take effect.

Once configured, the operation for Port Triggering will proceed as follows:

Step 1: A local host makes an outgoing connection using a destination port number defined in

the Trigger Port field.

Step 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.

Step 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.