Proxmox multiple public ip's @ online.net

steps.sh

# When you have access to proxmox web gui make sure you have all isos and fail over configured

# 1. Create a new new VM and set MAC the same as in the panel whilst handling fail over ips
# 2. Boot up the machine and go through the installation (skip networking part)
# 3. After installation login into the machine with VNC (through proxmox)
# 4. edit /etc/network/interface and add this:

auto lo ens18
iface li inet loopback
iface ens18 inet static
  address <fail over ip>
  netmask 255.255.255.255
  broadcast <fail over ip>
  post-up route add <vm host gateway> dev ens18
  post-up route add default gw <vm host gateway>
  pre-down route del <vm host gateway> dev ens18
  pre-down route del default gw <vm host gateway>
  dns-nameservers 62.210.16.6 62.210.16.7 8.8.8.8 8.8.4.4 
  
# 5. Then make sure to add these in /etc/resolv.conf

# old values
#nameserver 62.210.16.6
#nameserver 62.210.16.7
nameserver 8.8.8.8

# 6. then run command: ifconfig ens18 up
# 7. followed by: service networking restart
# 8. everything should be working