Hands-On: Practicing with AWS Elastic Network Interfaces (ENI)

Overview

In this practice session, we will: ✅ Launch two EC2 instances

✅ Explore the default network interfaces (ENI)

✅ Create a new ENI and attach it to an instance

✅ Move the ENI between instances to demonstrate failover

✅ Observe ENI behavior when instances are terminated

Step 1: Launch Two EC2 Instances

1. Go to AWS EC2 Dashboard
2. Click Launch Instances
3. Select Amazon Linux 2
4. Choose t2.micro instance type
5. Select an existing security group (e.g., launch-wizard-1)
6. Launch two instances

Confirm ENI for Each Instance

• Navigate to Networking for each instance.
• Scroll down to view the attached network interface (eth0).
• Each instance has:
  • ENI ID
  • Private IPv4
  • Public IPv4
  • Private IPv4 DNS