Sitecom WLM-1500 Manual page 50

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Public Port
Interface
Current Port
Forwarding Table
When you finish, click 'Apply Changes'. You'll see the following message
displayed on web browser:
Press 'Continue' to save the settings made and back to web management
interface; press 'Apply' to save the settings made and restart the router so the
settings will take effect after it reboots.
The destination port number that is made open for this
application on the WAN side
Select the WAN interface on which the port-forwarding
rule is to be applied.
If you want to remove the port forwarding settings from
the table, select the items and then click "Delete
Selected". If you want remove all settings, just click
"Delete All" button.