IPv6 unexpectedly operational without configuring anything

Hi,

I just realized that my proxmox hosts got assigned an IPv6 address from the internet provider box, since I changed one week ago from 'vlan aware' open-vswitch to the 'vlan unware' and default setting of vmbridge (which now supports large MTU, so I could get ride of open-vswitch).

I have thus configured a vmbr1 interface for the LAN connecting to the Internet box without any IPv4 nor IPv6 configured from proxmox GUI, two VMs instead are expect to filter the internet access having one of...

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