Suppose you want to add an additional IP to your Ubuntu Web Server, Here the steps are as follows: 1) Make sure your EC2 instance type will support more than 2 Network Interfaces. If not then you have to upgrade your Instance Type. 2) Add a New Network Interface. Make sure you give the same AZ, Subnet and Security Group as of the web server. 3) Now Add an Elastic IP and associate this elastic ip to the Web server. 4) Now attach the new Network Interface to the Webserver. Now the final part is , to create 2 route tables with default routes for each interface and use rules on inbound traffic to assign which table to use for the response traffic. 5) Here is a sample interface file that performs this: root@webserver:~# cat /etc/network/interfaces.d/eth0.cfg auto eth0 iface eth0 inet dhcp post-up ip route add default via 10.0.1.1 dev eth0 tab 1 post-up ip rule add from 10.0.1.81 tab 1 pre-down ip rule del from 10.0.1.81 tab 1 pre-down ip route del default via 10.0.1.1 dev