Example : on Debian / Ubuntu / Mint ...
File : /etc/network/interfaces
Edit interface file
vim /etc/network/interfaces
Add / Edit like this (Here FO ip address is 123.147.159.132)
# The primary network interface
auto eth0
iface eth0 inet dhcp
auto eth0:0
iface eth0:0 inet static
address 123.147.159.132
netmask 255.255.255.255
If the Failover IP does not respond try :
ifup eth0:0
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