An elastic IP address (EIP) is a public IP address that you can purchase and use as an independent resource. You can associate EIPs with Elastic Compute Service (ECS) instances, internal-facing Server Load Balancer (SLB) instances, secondary elastic network interfaces (ENIs), NAT gateways, and high-availability virtual IP addresses (HAVIPs). The ECS instances, internal-facing SLB instances, and secondary ENIs must be deployed in virtual private networks (VPCs).
EIPs are NAT IP addresses deployed on Internet gateways of Alibaba Cloud, and are mapped to the associated cloud resources through NAT. After EIPs are associated with cloud resources, the cloud resources can use the EIPs to communicate with the Internet.
|Apply for an EIP||
||Apply for an EIP|
|Associate an EIP with a cloud resource||
|Associate an EIP with an EIP bandwidth plan||EIPs associated with EIP bandwidth plans have higher and more flexible bandwidth||Associate an EIP with an EIP bandwidth plan|
- Independently purchased and owned resource
You can purchase and use an EIP as an independent resource. EIPs are not bundled with other computing or storage resources.
- Association with other cloud resources as needed
You can associate an EIP with a cloud resource as needed. You can also disassociate and release an EIP as needed to prevent unexpected charges.
- Flexible configuration
You can modify the maximum bandwidth of an EIP based on your business requirements. The modification immediately takes effect.
- Flexible billing and low costs
Multiple billing methods are supported, including subscription, pay-by-bandwidth, and pay-by-data-transfer. You can reduce bandwidth costs after you associate an EIP with an EIP bandwidth plan.
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 lines optimize data transmission to the Chinese mainland and improve connection quality for international services. Compared with BGP (Multi-ISP), when BGP (Multi-ISP) Pro lines provide services to users in the Chinese mainland (excluding data centers), cross-border connections are established by using Chinese mainland ISP services. This reduces network latency.|
|Region||All regions||China (Hong Kong)|
Differences between an EIP and the static public IP address of an ECS instance
The following table describes the differences between an EIP and the static public IP address of an ECS instance.
|Feature||EIP||Static public IP address|
|Supported network||VPC||VPC and classic network|
|Used as an independent resource||Supported||Not supported|
|Associated with and disassociated from an ECS instance as needed||Supported||Not supported|
|Displayed in the ENI information of the associated ECS instance||Cut-through mode: Displayed||
Classic network: Displayed
VPC: Not displayed