If you are using more than one floating IP, then the number on the interface (eth0:1) will be increased (example eth0:2).
On Debian based distributions (Ubuntu, Debian):
1. Access the server via SSH
2. 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
3. Paste the following configuration into the editor and replace your.Float.ing.IP with your Floating IP
IPv4:
auto eth0:1
iface eth0:1 inet static
address your.Float.ing.IP
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
4. Now you should restart your network. Caution: This will reset your network connection
sudo service networking restart
On RHEL based distributions (Fedora, CentOS):
1. Access the server via SSH
2. Create the configuration file and open an editor
touch /etc/sysconfig/network-scripts/ifcfg-eth0:1 vi /etc/sysconfig/network-scripts/ifcfg-eth0:1
3. Paste the following configuration into the editor and replace your.Float.ing.IP with your Floating IP
IPv4:
BOOTPROTO=static
DEVICE=eth0:1
IPADDR=your.Float.ing.IP
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
4. Now you should restart your network. Caution: This will reset your network connection
systemctl restart network
