About a month and a half ago I grew so frustrated by the boneheaded way that Amazon EC2 handles IP aliasing that I wrote a pretty lengthy post about the problems entailed and included a small program that would fix those problems . Amazon provides some pretty productive documentation for some types of users. There is help available for you if you are any one of the following: - You are willing to pay for a new ENI to support a second IP address - You are multihoming / load balancing - You want to use "Amazon Linux" and install their ec2-net-utils But, if you want to just add a second IP address to a pre-existing Linux server, you are pretty much screwed. Well, you were screwed. Now you can install my program - aliaser - as a service and it will route additional IP addresses for you without the need for an extra ENI. I've uploaded aliaser to Github - it includes a shell script and a .service file, as well...