Monoprice PID 8743 Wireless N ADSL2 Modem and Router 802 11N WPS Function 2T2R 300Mbps - Manual (Page 74)

ADSL2/2+ Router
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
Use Interface: It indicates which WAN connection the configured
rules are to be applied to. When there is only one configured
WAN connection available, system will select it automatically.

Application Name: There are two options available:
(1) Select an application: allows you to select an existing application
from the drop-down list box.
(2) Custom application: allows you to define an application
yourself.

Trigger Port Start/ Trigger Port End: The port range for
application programs to initiate connections.

Trigger Protocol: There are 3 options: TCP, UDP and TCP/UDP.
We recommend you to select TCP/UDP if you are not sure about
which protocol to choose.

Open Port Start/ Open Port End: the port range that will be
automatically enabled by the built-in firewall when connections