Inbound Filter
The Inbound Filter option is an advanced method of controlling data received from the Internet. With this feature you can configure inbound data filtering rules that control data based on an IP address range.

Inbound Filters can be used for limiting access to a server on your network to a system or group of systems. Filter rules can be used with Virtual Server, Port Forwarding, or Remote Administration features.

Add Inbound Filter Rule
Enable Source IP Start Source IP End

Inbound Filter Rules List
Name Action Source IP Range