AWS EC2 Enable Secondary IPs

Here’s how to enable secondary private IPs for AWS EC2 instances.

  1. Add secondary private IPs to the instance.
    • Editing the instance Networking > Manage IP Addresses.
    • Add new private IP addresses.
    • Save.
  2. Set the route configuration for each secondary IP address.
    • Config files are ifcfg-eth0:0, ifcfg-eth:0.1 and so on.
    • Test each interface or IP to see if they respond to ping.
    • /etc/sysconfig/network-scripts/

ifcfg-eth0:0

NM_CONTROLLED="no"
DEVICE="eth0:0"
ONBOOT="yes"
BOOTPROTO="static"
IPADDR="10.0.0.14"
NETMASK="255.255.255.255"

ifcfg-eth0:1

NM_CONTROLLED="no"
DEVICE="eth0:1"
ONBOOT="yes"
BOOTPROTO="static"
IPADDR="10.0.0.15"
NETMASK="255.255.255.255"