Key Concepts

Last updated: 2020-02-25 17:25:51

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Before using an ENI, you need to understand the following concepts:

Primary ENIs and Secondary ENIs

  • When VPC's Cloud Virtual Machine was founded, ENI, whose ENI attribute was mainly ENI.
  • User-created ENI, its ENI attribute is Secondary ENI.
  • The primary ENI cannot be unbound, while secondary ENIs can.

Primary Private IP Addresses

  • The primary private IP address of an ENI can be randomly assigned by the system or defined by users when the ENI is created.
  • The primary private IP address of the primary ENI can be changed, while that of an secondary ENI cannot be changed.

Secondary Private IP Addresses

  • A secondary private IP address that is bound to an ENI can be configured by users when the ENI is created or edited.
  • A secondary private IP address can be bound and unbound.

Eips

EIPs are bound with the private IP addresses of an ENI in one-to-one fashion.

Security Groups

An ENI can be bound with one or more security groups.

MAC Addresses

An ENI has a globally unique MAC address.