Use non local gateway

Hello,

I am unable to find how I can enable the edgerouter to use a non local gateway.

The setup we want:

DSL cable>Draytek vigor 130 modem> edgerouter

The thing is, we want the WAN IP to be passed to the edgerouter, so we set the following on the Vigor 130:

http://just.draytek.com/index.php?option=com_k2&view=item&id=1256&Itemid=293&lang=en

(Look for Active True IP)

But, for PPPoE it is normal to have a gateway that lies out of the clients subnet. On pFsense we have the tick box as in the attachment.

So that's how it is being fixed there.

Is there any way to enable the same thing in the edgerouter?

Thanks in advance!