If your BT connection uses PPPoE then you will need to setup a PPPoE connection on your laptop if connecting the laptop directly to the modem. You normally don't need to touch the settings on the Draytek 130 but go through the steps below to ensure the settings are correct:
1. Connect your computer directly to the modem's LAN port and access the DrayTek modem's web interface via your web browser, which will be accessible on
http://192.168.2.1 by default. Enter the username of "admin" and the default password of "admin".
2. Browse to [Internet Access] > [General Setup], set the VLAN Tag insertion (VDSL2) setting to Enable. Set the Tag Value to 101.
The DSL mode can be set to "VDSL2 only" to speed up sync times but this is not required.
Click OK on that page to apply the changes.
VDSL image 1
3. Go to [Internet Access] > [MPoA / Static or Dynamic IP], select the Enable radio button at the top of the page to ensure that the MPoA (RFC1483/2684) bridge mode is enabled.
VDSL image 2
Click OK on this page to apply the changes and the modem will then prompt to restart. Click OK to restart the modem.
4. Connect the modem's LAN port to your router's Ethernet WAN port and set the router's WAN interface to receive an IP via DHCP.
When connecting the D7800 to the Draytek 130, the D7800 should automatically detect the connection from the Draytek and offer you further options accordingly, if not have a look on p66 in the D7800 user manual
http://www.downloads.netgear.com/files/GDC/D7800/D7800_UM_EN.pdf