Add a Second Elastic IP Address with a Single Elastic Network Interface to an EC2 Instance
When you add a second Elastic IP address to an elastic network interface, that Elastic IP address is lost when the interface is rebooted. To make the second Elastic IP address persist during the reboot, you must create a second interface configuration file (ICF).
ICFs control the software interfaces for individual network devices. The system uses these files as it boots to determine what interfaces to bring up and how to configure them.
The default ICF is /etc/sysconfig/network-scripts/ifcfg-eth0. When there are two Elastic IP addresses on a single interface, the second Elastic IP address becomes ":1"—that is, /etc/sysconfig/network-scripts/ifcfg-eth0:1.
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