PLANET WNRT-627 - Manual (Page 76)

User’s Manual of WNRT-627
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5.8.2 Port Triggering
Choose menu “ Forwarding→Port Triggering”, you can view and add port triggering in the next
screen (shown in Figure 5-26 ). 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 5-26 Port Triggering
Once the Router is configured, the operation is as follows:
1. A local host makes an outgoing connection using a destination port number defined in the
Trigger Port field.
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.
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.
The page includes the following fields:
Object Description
Trigger Port The port for outgoing traffic. An outgoing connection using this port will
"Trigger" this rule.
Trigger Protocol The protocol used for Trigger Ports, either TCP, UDP, or All (all protocols
supported by the Router).
Incoming Ports Range The port or port range used by the remote system when it responds 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 set apart with ",". For example,
2000-2038, 2050-2051, 2085, 3010-3030.