An Elastic IP Address (EIP) is a public IP address that you can purchase and hold as an independent resource. You can associate an Elastic IP Address with an Elastic Compute Service (ECS) instance deployed in a virtual private cloud (VPC), an internal Server Load Balancer (SLB) instance deployed in a VPC, or a secondary elastic network interface (ENI) attached to a VPC. You can also associate an EIP with a NAT gateway, or a High-Availability Virtual IP Address (HAVIP).
An Elastic IP Address is also a NAT IP address that is provisioned in a public-facing gateway of Alibaba Cloud and is mapped to the associated cloud resource with NAT. After an Elastic IP Address is associated with a cloud resource, the cloud resource can connect to the Internet by using this Elastic IP Address.
The Elastic IP Address and a public IP address has the following difference:
Elastic IP Address has the following benefits:
Elastic IP Address (EIP) imposes limits on its features. We recommend that you understand the limits before you use the features.
Take note of the following limits before you associate an EIP with an Elastic Compute Service (ECS) instance:
Take note of the following limits before you associate an Elastic IP Address with a NAT gateway:
Take note of the following limits before you associate an Elastic IP Address with a Server Load Balancer (SLB) instance:
Take note of the following limits before you associate an Elastic IP Address with a secondary ENI:
Independent public IP address resources can be bound to Alibaba Cloud VPC-type ECS instances, NAT gateway, and Intranet Server Load Balancer. Also, they can be dynamically unbound, which decouples public IP addresses from ECS instances, NAT gateway, and Server Load Balancer, meeting the needs for flexible management.
An independent public IP resource that decouples ECS and public IP resources, allowing you to flexibly manage public IP resources.
Initially, each Alibaba Cloud Elastic Network Interface (ENI) could have only a single Private IP Assigned to it. One could assign multiple Network Cards to an instance depending on the Instance type. However, we have new functionality that will allow assigning of Multiple Private IP's to one ENI. Besides, we can use the NAT Gateway to Map an Elastic IP to every Private IP that is assigned to an ENI. This allows having multiple EIP's assigned to an Elastic Compute Service (ECS) Instance in NAT Mode.
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