More and more fiber connections in Belgium as Proximus is enlarging their network.
For a customer with an OPNsense appliance we ordered a fiber connection from EDPnet without any hardware from the provider (typically a Fritz!box) (https://www.edpnet.be/en/business/fiber.html Fiber PRO with fixed IP).
To install this new connection in OPNsense I followed this tutorial
https://forum.opnsense.org/index.php?topic=9324.0#msg51070 (bottom post).
VLAN tag should be 10 as per this post
https://www.edpnet.be/en/support/ordering/internet/learn-about-fiber/which-routers-can-i-use-on-my-fiber-connection.html
Just don't forget to add @edpnet.net to the user name you have been given.
Hope this can help some people out.