Enhanced networking is required for the latest instance types (t3, m5, r5, etc). This allows for faster EBS burst (>250 MBps) and better network throughput at a slightly lower cost. As a workaround, it's possible to enable enhanced networking with the API and CLI tools if you already have an instance running: Get your instance ID: (should look like i-123456789abcdef) Stop your instance Change your instance type: (m5.* t3.* etc) Enable enhanced networking: aws ec2 modify-instance-attribute --instance-id i-123456789abcdef --ena-support Start your instance again, and wait for it to come back online To roll back, you can disable ENA and change back to your previous instance: aws ec2 modify-instance-attribute --instance-id i-123456789abcdef --no-ena-support
