We have a few members from Italy on this forum, so hopefully one will see and help 
(I think your VLAN ID is correct otherwise you would not get a Internet connection, but it is worth checking)
(Note: to myself, create a VLAN ID (802.1q) Wiki page) 
Edit: Wiki created – https://uktechhub.com/forums/topic/modem-vlan-id-tag-802-1q-reference-table/
In a completely sane world, madness is the only freedom (J.G.Ballard).
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