Configure Persistent Floating IPs

Knowledgebase

If you use more than one Floating IP, the number on the interface (eth0:1) will increase (example eth0:2).

On Debian based distributions (Ubuntu versions before 20.04, Debian):

Create the configuration file and open an editor:

touch /etc/network/interfaces.d/60-my-floating-ip.cfg
nano /etc/network/interfaces.d/60-my-floating-ip.cfg

Paste the following configuration into the editor and replace 11.22.33.44 with your Floating IP:

IPv4:

auto eth0:1
iface eth0:1 inet static
 address 11.22.33.44
 netmask 32

IPv6:

auto eth0:1
iface eth0:1 inet6 static
 address one IPv6 address of the subnet, e.g. 2a01:4f9:0:2a1::2
 netmask 64

Now you should restart your network. Caution: This will reset your network connection:
```
sudo service networking restart
```

Create the configuration file and open an editor:

touch /etc/netplan/60-floating-ip.yaml
nano /etc/netplan/60-floating-ip.yaml

Paste the following configuration into the editor and replace 11.22.33.44 with your Floating IP:

IPv4:

network:
   version: 2
   renderer: networkd
   ethernets:
     eth0:
       addresses:
       - 11.22.33.44/32

IPv6:

network:
   version: 2
   renderer: networkd
   ethernets:
     eth0:
       addresses:
       - your.float.ing.ip/64

Now you should restart your network. Caution: This will reset your network connection:
```
sudo netplan apply
```

Create the configuration file and open an editor:

touch /etc/sysconfig/network-scripts/ifcfg-eth0:1
vi /etc/sysconfig/network-scripts/ifcfg-eth0:1

Paste the following configuration into the editor and replace 11.22.33.44 with your Floating IP:

IPv4:

BOOTPROTO=static
DEVICE=eth0:1
IPADDR=11.22.33.44
PREFIX=32
TYPE=Ethernet
USERCTL=no
ONBOOT=yes

IPv6:

BOOTPROTO=none
DEVICE=eth0:1
ONBOOT=yes
IPV6ADDR=one IPv6 address of the subnet, e.g. 2a01:4f9:0:2a1::2/64
IPV6INIT=yes

Now you should restart your network. Caution: This will reset your network connection:
```
systemctl restart network
```