Elastic Network Interfaces (ENI)

Logical component in a VPC that represents a virtual network card.

When you create your own ENI, Deleting the EC2 would not delete the ENI.

To Know more on this topic: https://aws.amazon.com/blogs/aws/new-elastic-network-interfaces-in-the-virtual-private-cloud/

• The ENI can have the following attributes:

  • Primary private IPv4, one or more secondary IPv4.

  • One Elastic IP (IPv4) per private IPv4.

  • One Public IPv4.

  • One or more security groups.

  • A MAC address.

• You can create ENI independently and attach them on the fly (move them) on EC2 instances for failover.

• Bound to a specific availability zone (AZ)

Attaching and detaching an ENI