How to add multiple IP address to Linux System
1. Open /etc/network/interfaces
vi /etc/network/interfaces
2. Add the lines here
auto eth0:1
iface eth0:1 inet static
address 172.93.99.28
gateway 172.93.99.25
netmask 255.255.255.248
dns-nameservers 8.8.8.8
#It looks like the following
auto eth0
auto eth0:1
iface eth0 inet static
address 172.93.99.27
gateway 172.93.99.25
netmask 255.255.255.248
dns-nameservers 8.8.8.8
iface eth0:1 inet static
address 172.93.99.28
gateway 172.93.99.25
netmask 255.255.255.248
dns-nameservers 8.8.8.8
3. Reboot or do a network restart
/etc/init.d/networking restart
Or
reboot