Tenda V1200 User Manual page 114

Parameter
Trigger Protocol
Open Port Start/ Open
Port End
Open Protocol
Description
Select the protocol from the drop-down list. If you are unsure, select TCP/UDP.
These are the starting number and ending number for the ports that are
automatically opened by the built-in firewall when connections initiated by an
application are established.
The protocol to be used by the built-in firewall when connections are initiated.
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