EverFocus ERS-4 Instruction Manual page 108

Start/End - Enter the starting number of the range under Start and the ending number under End.
Protocol - Enter the protocol used for this application, either TCP or UDP, or Both.
IP Address - For each application, enter the IP Address of the PC running the specific application.
Enable - Click the Enable checkbox to enable port forwarding for the relevant application.
When finished making changes, click the Save Settings button to apply your changes or Cancel
Changes to cancel them.
Here is an example for how the port information might look:
HTTP 80 to 80
CTRL 1600 to 1600
Note: If you changed port 80 in the DVR's Network Menu, open that port instead of 80.
Both 192.168.1.50
Both 192.168.1.50
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ERS-4 Instruction Manual
Enable
Enable