PDF. An elastic network interface is a logical networking component in a VPC that represents a virtual network card. It can include the following attributes: A primary private IPv4 address from the IPv4 address range of your VPC. One or more secondary private IPv4 addresses from the IPv4 address range of your VPC.

What is the use of AWS Eni?

Essentially, ENIs are virtual network cards you can attach to your EC2 instances. They are used to enable network connectivity for your instances, and having more than one of them connected to your instance allows it to communicate on two different subnets.

What is the difference between EIP and ENI?

A single EC2 instance can be attached to two ENIs, each one on a distinct subnet. The ENI (not the instance) is now associated with a subnet. … The EIP is attached to the ENI and the ENI is attached to instance-A. Both EC2 instances run a Web Server.