TL-WR542G 54M Wireless Router User Guide
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5.7.2 Port Triggering
Some applications require multiple connections, like Internet games, video
conferencing, Internet telephoning 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. You can set up Port Triggering on this page shown in figure 5-20:
Figure 5-20: Port Triggering
Once configured, 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. The Internet host receives the PCs request, and responds using a different port
number.
4. This Router matches the response to the previous request, and forwards the
response to the PC.
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 or UDP, or All
(include all protocol that can be access 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 apart with ",". For example,
2000-2038, 2050-2051, 2085, 3010-3030.
Incoming Protocol – The protocol used for Incoming Ports Range, either TCP or
