Draytek Vigor2866ac Quick Start Manual page 23

Set the Service - Tag value to 101 if you're in the UK.
Set the Service - Tag value to 10 if you're in Ireland.
Note These VLAN tag values are required to connect to ISPs that operate
on the Openreach or OpenEir VDSL2 networks, if your ISP operates on
a different VDSL2 network, this tag value may differ.
Please check with your ISP or the DrayTek UK Knowledgebase for ISP
specific guides.
The DSL mode can be set to "VDSL2 only" but this is not required.
Click OK on that page to apply the changes.
3. Go to [WAN] > [Internet Access]
Set the WAN1 Access Mode to PPPoE / PPPoA, then click the Details Page button
to proceed:
4. On the PPPoE / PPPoA settings tab:
Select the Enable radio button at the top of the page to ensure that the PPPoE
interface is enabled.
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