By placing a OpenWRT router after Vilfo, your OpenWRT router can be used to extend the wireless network of Vilfo.
Turning your OpenWRT router into an access point
Log in to your OpenWRT router admin interface
Navigate to Network -> Interfaces
Locate the LAN interface
Click on Edit
Find the field Protocol
Select DHCP client from the drop-down
You will be prompted with a new message asking if you want to switch the protocol, click the button labeled Switch protocol
Click on Save and apply
Connect a network cable between the LAN port on your Vilfo and the LAN port on your OpenWRT router
To make future changes in OpenWRT you will need to do so using the IP address assigned to your OpenWRT router by Vilfo.
Note! If you choose to use your OpenWRT router as an access point, you may want to disable the Wireless network in Vilfo.