This configuration and matching firmware allows the DV130 to sit in front of a firewall/router to creates a layer 2 bridge that inserts a VLAN ID of 10, then strips the VLAN tag when handing traffic back to the router. This means that the router/firewall behind the DV130 can simply operate as a PPPoE initiator, DHCP or fixed IP address (service provider dependent) without the added hassle of configuring virtual sub interfaces. 

If you want to instead add VLAN IDs on your internal router/device then just disable the Draytek VLAN tag insertion under "Internet Access >> General Setup".

Download the ZIP file with config, firmware and simple instructions from here:

NOTE: This will bridge VDSL or Enhanced UBA ADSL circuits both of which require a VLAN ID of 10.