Astak R4020A - User Manual - Manual (Page 58)

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Firewall
Firewall is a network security tool that protects the computer from network attacks.
Note: Firewall is only supported in Gateway mode. It’s disabled and hidden in Bridge
mode.
Port Filtering
This function is used to restrict the data pass through the ports in a specified range.
Item Description
Enable Port Filtering Check the box to enable the port filtering function.
Port Range
Set the range for the ports that you want to restrict data pass
through.
Protocol
There are 3 types of protocol provided: TCP/UDP, TCP and UDP.
Select one type as you need.
Comment You can add some description as comment for the ports.
Current Filter Table
The table lists the filtered ports you have added.
If you want to remove one or more records, check the “Select”
boxes of the records and click the
button.
If you want to remove all the settings, click the
button.
Click the
button to uncheck all the boxes.
After setting the parameters, please click the button to save the
configurations, or click the button to reset the configurations before you
changed them.