I have a server from hetzner, and install proxmox on it.
My configuration is simple, and it's my "/etc/network/interfaces" file:
auto lo
iface lo inet loopback
iface enp6s0 inet manual
auto vmbr0
iface vmbr0 inet static
address XX.YY.ZZ.TT
netmask 255.255.0.0
gateway...