Node: /etc/network/interfaces

# HETZNER EX62, Proxmox 7.1-11 @ Debian 11 Node
# THIS CONFIGURATION IS NOT WORKING
# Loopback device:
auto lo
iface lo inet loopback
iface lo inet6 loopback

auto eno1
iface eno1 inet static
  address 162.xxx.95.99
  netmask 255.255.255.255
  pointopoint 162.xxx.95.65
  gateway 162.xxx.95.65
  broadcast 162.xxx.95.127
#  up route add -net 162.xxx.95.64 netmask 255.255.255.192 gw 162.xxx.95.65 dev eno1

iface eno1 inet6 static
  address 2a01:xxx:xxx:281d::2
  netmask 64
  gateway fe80::1
  up sysctl -p

# single-IPs
auto vmbr0
iface vmbr0 inet static
  address 162.xxx.95.99
  netmask 255.255.255.255
  bridge_ports none
  bridge_stp off
  bridge_fd 0
  up route add -net 162.xxx.95.64/26 dev vmbr0

iface vmbr0 inet6 static
  address 2a01:xxx:xxx:281d::3
  netmask 64
  up ip -6 route add 2a01:xxx:xxx:281d::3/64 dev vmbr0

# additional IPv4 Subnet
auto vmbr1
iface vmbr1 inet static
  address 162.xxx.95.66
  netmask 255.255.255.192
  bridge_ports none
  bridge_stp off
  bridge_fd 0