An Elastic Network Interface (ENI) is a virtual network interface that you can attach to an EC2 instance in a Virtual Private Cloud (VPC), representing a logical networking component that includes a primary private IPv4 address, one or more secondary IPv4 addresses, an Elastic IP address, a MAC address, and security groups.
An Elastic Network Interface (ENI) is a virtual network interface that you can attach to an EC2 instance in a Virtual Private Cloud (VPC). It is a logical networking component that includes a primary private IPv4 address, one or more secondary private IPv4 addresses, an Elastic IP address, a MAC address, and security groups. ENIs are fundamental to how EC2 instances communicate within a VPC, with the internet, and with other AWS services. Each EC2 instance has a default ENI (the primary network interface) attached at launch, but you can create and attach additional ENIs to create multi-homed networks or specialized network appliances.
Management Network: Create a separate management network interface for administrative traffic, isolating it from application traffic
Network Appliances: Use multiple ENIs in a dual-homed configuration for appliances like firewalls or load balancers
High Availability: Quickly move a failed application's ENI to a standby instance for fast failover
Logging and Monitoring: Dedicate an ENI for log collection or monitoring traffic without affecting primary network performance
Multi-Subnet Deployment: Attach an instance to multiple subnets, useful for scenarios requiring access to resources in different subnets
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