September 2018
Beginner to intermediate
174 pages
3h 27m
English
Content preview from Designing AWS Environments
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Elastic network interface (ENI)
Each EC2 instance has one or more Elastic Network Interface, or ENIs, attached, and the IP addresses are actually assigned to these. You can think of them as virtual network cards.
Each instance has one ENI, designated eth0, attached by default, known as the primary ENI. The IPs given to your instance at launch are assigned to the primary ENI. The primary ENI cannot be detached from the instance. However, you can create additional ENIs, and attach them as secondary network interfaces to an instance. This doesn't increase the overall network capacity of the instance, but you can detach a secondary ENI and move it to another instance. This will actually move the IP addresses with it. So if you need to replace ...
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