Gembird NSW-R4 - Manual (Page 27)

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GEMBIRD EUROPE B.V. http://www.gembird.eu
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NSW-R4 WIRELESS BROADBAND ROUTER, 300M
4.2.2 Trigger Port
Some applications (like Internet games, video conferencing, Internet
calling and so on) require multiple connections. These applications cannot
work with a pure NAT router. Port Triggering is used for some of these
applications to let them work with a NAT router.
Status: Check on to enable this function.
Trigger Port Range: 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
both.