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.

Features

Feature Description References
Apply for an EIP
  • Apply for a new EIP
  • Recover a released EIP
  • Apply for contiguous EIPs
Apply for an EIP
Associate an EIP with a cloud resource
  • Associate an EIP with an ECS instance deployed in a VPC
  • Associate an EIP with an internal-facing SLB instance deployed in a VPC
  • Associate an EIP with a NAT gateway
  • Associate an EIP with an HAVIP
  • Associate an EIP with a secondary ENI
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

Benefits

EIPs have the following benefits:
  • 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.

Line types

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.
  • Up to 89 high-quality BGP lines are available worldwide.
  • Direct connections can be established in all regions of mainland China through lines of the following Internet Service Providers (ISPs): China Telecom, China Unicom, China Mobile, China Mobile Tietong, China Netcom, China Education and Research Network (CERNET), National Radio and Television Administration, Dr. Peng Telecom & Media Group, and Founder Broadband Network.
  • You can use BGP (Multi-ISP) with EIP bandwidth plans to obtain higher bandwidth (up to 100 Gbit/s).
BGP (Multi-ISP) Pro lines optimize data transmission to China and improve connection quality for international services. Compared with BGP (Multi-ISP), when BGP (Multi-ISP) Pro provides services to users in mainland China (excluding data centers), cross-border connections are established by using mainland China ISP services. This reduces network latency.
Regions 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

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