Introduction to VPC Elastic Network Interfaces
Introduction to VPC Elastic Network Interfaces is an elastic network interface (ENI) allows an instance to communicate with other network resources including AWS services, other instances, on-premises servers, and the Internet. It also makes it possible for you to connect to the operating system running on your instance to manage it. As the name suggests, an ENI performs the same basic function as a network interface on a physical server, although ENIs have more restrictions on how you can configure them. Every instance must have a primary network interface (also known as the primary ENI) , which is connected to only one subnet. This is the reason you have to specify a subnet when launching an instance. You can’t remove the primary ENI from an instance. Related Products: – AWS Certified Solutions Architect | Associate Primary and Secondary Private IP Addresses Each instance must have a primary private IP address from the range specified by the s...