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.

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 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)

Benefits

EIPs have the following benefits:
  • 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.