AWS Networking
Networking Elastic Network Interfaces - ENI An Elastic Network Interface (ENI) is a virtual network interface that the user can attach to an instance in a VPC. The user can attach up to two ENIs with a single instance. However, AWS cannot assign a public IP when there are two ENIs attached to a single instance. It is recommended to assign an elastic IP in this scenario. Logical units and represent Network interface card in AWS One ENI can be attached to one instance only. However they can be detached and the attached to another instance. ENI is connected with one primary or default private IP address. Primary cannot be detached. It can be connected to more than 1 secondary private IP addresses. For each Private IP address we can 1 elastic IP. We can associate 1 Public IP address Source Destination enabled flag ENI can be attached when the instance is running, stopped or launched. Instance can be attached to 2 ENI - 1 public IP in Subnet 1 to allow internet traffic to i...