ubuntu 18.10

New to Proxmox , I recently installed on a OVH's dedicated server a 5.4-13 (zfs) Proxmox VE. I needed to have one LXC container with 1 unused public IP (IP failover) and 1 LAN IP (for connecting with other LAN-only containers). I used the set up described by OVH (ovh mac address , fail-over IP...