Network interfaces

  • An elastic network interface (network interface) is a virtual network interface that you can attach to an instance in a VPC.

  • Network interfaces are available only for instances running in a VPC. A network interface can include the following attributes:

  1. A primary private IPv4 address.

  2. One or more secondary private IPv4 addresses

  3. One Elastic IP address (IPv4) per private IPv4 address

  4. One public IPv4 address

  5. One or more IPv6 addresses

You can create a network interface, attach it to an instance, detach it from an instance, and attach it to another instance.

  • When you move a network interface from one instance to another, network traffic is redirected to the new instance.

  • Every instance in a VPC has a default network interface, called the primary network interface (eth0). You cannot detach a primary network interface from an instance. You can create and attach additional network interfaces

(The maximum number of network interfaces that you can use varies by instance type).

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