In the EU and UK, the Draytek Vigor 130 (and probably the old 120 as well), are configured in Bridge mode (this is different from the US model).
Most of the information in this document has been collected from multiple source, and there are several ways of doing the same thing. I will just summarise the steps I have used. All of the sources describe how to configure the Edge Router or the USG3/USG-Pro4. I also add the instructions on how to configure the Unify Dream Machine Pro (UDM-Pro) (these mya also work with Unifi Dream Machine (UDM-Base) but I do not have one yet to test).
We assume that all machines are left at their default settings but all these can be changed.