This topic provides an overview of Elastic IP Address. An elastic IP address (EIP) is a public IP address that you can purchase and hold as an independent resource. You can associate an EIP 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 EIP 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 EIP is associated with a cloud resource, the cloud resource can connect to the Internet by using this EIP.
EIP supports the line types of BGP (Multi-ISP) and BGP (Multi-ISP) Pro. The following table lists the differences between BGP (Multi-ISP) and BGP (Multi-ISP) Pro.
|Item||BGP (Multi-ISP)||BGP (Multi-ISP) Pro|
|Advantages||BGP (Multi-ISP) provides high-quality and high-bandwidth BGP lines.
||BGP (Multi-ISP) Pro has all the advantages of BGP (Multi-ISP). Compared with BGP (Multi-ISP), when BGP (Multi-ISP) Pro provides services to clients in mainland China (excluding data centers), cross-border connections are established without using international ISP services. This reduces network latency.|
|Supported regions||All regions||China (Hong Kong)|
- Independent purchase and possession
You can purchase and hold an EIP as an independent resource. EIPs are not bundled with other computing or storage resources.
- Flexible association
You can dissociate an EIP from a cloud resource and then release the EIP if the EIP is no longer needed. This prevents unexpected charges on your account.
- Configurable network capabilities
You can adjust the peak bandwidth of an EIP at any time. The bandwidth changes take effect immediately.