You must select adapters to hook packets from.

If adapters not selected - NetCom does not handle any packets!

Enable checkbox on the needed NIC's. At this moment for packets from and to this adapters will be applied rules.

Don't select adapters that don't need to filter.

Every selected adapter decreases system processor performance.

If you use Dial-Up, VPN, PPPoE or any other connection-oriented connections - select WAN interface. All packets from this connections goes through this adapter.