Hetzner Proxmox IP setup

Since I myself have searched far too long to correctly set my AP addresses at hetzner I wanted to give a small guide for it here.

Proxmox Host Settings

First you have to change some settings in /etc/network/interfaces. (My config looks like this)

auto lo
iface lo inet loopback

# device: enp5s0
auto enp5s0
iface enp5s0 inet static
  address <Host IPv4>
  netmask 255.255.255.255
  pointopoint <Host gateway>
  gateway <Host gateway>

iface enp5s0 inet6 static
  address  <Host IPv6>2   # like 2001:db8::2
  netmask 128
  gateway fe80::1
  up sysctl -p

auto vmbr0
iface vmbr0 inet static
  address <Host IPv4>
  netmask 255.255.255.255
  bridge_ports none
  bridge_stp off
  bridge_fd 0
  sysctl -w net.ipv4.ip_forward=1
  sysctl -w net.ipv6.conf.all.forwarding=1
  up ip route add <Additional single IP 1>/32 dev vmbr0
  up ip route add <Additional single IP 2>/32 dev vmbr0
  up ip route add <Additional single IP 3>/32 dev vmbr0
  up ip route add <Additional single IP 4>/32 dev vmbr0
  up ip route add <Additional single IP 5>/32 dev vmbr0
  up ip route add <Additional single IP 6>/32 dev vmbr0



iface vmbr0 inet6 static
  address  <Host IPv6>1   # like 2001:db8::1
  netmask 64

Host IPv4 = is the lowest ip address without the extra symbol next to it
Host gateway = is the ip under gateway when hovering over the ip address
With the ip address you have to be careful that you change the end because otherwise this does not work like in the example my ips are "0000:0000:0000:49b::2" and "0000:0000:0000:49b::1".

VM/CT config

In proxmox for the VM via cloudinit you have to specify this: just keep in mind that the gateway for the Additional single IP from now on will be the main ips you specified for vmbr0.