AWS - EC2 - Assign Multiple IPs to the Same Instance

gistfile1.txt

1. Assign a secondary private ip to the instance
     - Select the instance, then choose Actions > Mange Private IP Addresses
     - In the Manage Private IP Addresses dialog box, Click "Assign new IP"
     - Enter a specific IP address that's within the subnet range for the instance (or just leave the field blank to have it choose one for you)
     - (Optional) Select Allow reassignment to allow the secondary private IP address to be reassigned if it is already assigned to another network interface.
     - Click Yes, Update, and then click Close.

2. Add the new IP to the instance's network interface.
     - SSH into the instance
     - $ sudo ip addr add new.ip.address.here/20 dev eth0

     - Test to make sure the ip is listed:
     - $ ip addr list dev eth0

     Note: If you ever need to remove the new IP use:
     $ sudo ip addr del new.ip.address.here/20 dev eth0

3. Assign an Elastic IP to your new private IP
     - In the AWS Console, choose "Elastic IPs"
     - Select an available IP and choose "Associate Address"
     - Choose the instance, and *importantly*, in the Private IP section, be sure to select the NEW private ip you just created.
Click "Associate"