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    Elastic IP (EIP)

    Last updated: 2024-04-10 14:28:59
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      Overview

      Elastic IP (ElP) is a regional static IP designed for dynamic cloud computing. With EIP, you can quickly map an address to another instance (or NAT gateway instance) in your account for failure isolation.
      The lifecycle of a public IP is bound with a CVM, which means that the public IP is released when the associated CVM is terminated. However, the lifecycle of an EIP is independent of the CVM. An EIP is always available under your account unless you release it. If you want to retain a public IP after the termination of the associated CVM, convert it to an EIP.

      IP Address Type

      Tencent Cloud supports various types of EIPs, such as general BGP IP, premium BGP IP, accelerated IP, and static single-line IP.
      General BGP IP: The domestic multi-line BGP network covers more than twenty ISPs (including the three major ISPs, CERNET, and China Broadnet). The BGP public network outbound supports switchover across regions within seconds, providing your users with high-speed and secure networks.
      Premium BGP IP: Dedicated lines can avoid the use of international ISP services. The latency is lower, which effectively improves the quality of overseas services for users in Chinese Mainland.
      Accelerated IP: Anycast is used for acceleration to ensure more stable and reliable public network access with a low latency.
      Static single-line IP: Users can access the public network using services of a single ISP, featuring low cost and convenient scheduling.
      Anti-DDoS EIP: This type of GBP IP provides Tbps-level cloud-native DDoS protection capability and should be used together with Anti-DDoS Pro for Enterprise. After the IP address is bound to business resources and Anti-DDoS Pro resources, users can enjoy the anti-DDoS capability.

      IP Resource Pool

      If certain adjacent IP addresses need to be reserved for your services or IP addresses in a specific network segment should be allocated, you can submit a ticket for consultation. A dedicated IP resource pool will be assigned for you.
      Dedicated resource pools are supported for general and premium BGP IPs and static single-line IPs currently.
      For the fees, please consult your business manager.

      Public IP vs EIP

      Both public IPs and EIPs are used of internet access.
      Public IP: It is assigned automatically upon the creation of CVM and cannot be unbound from the CVM.
      EIP: It’s purchased independently. It can be bound with/unbound from cloud resources (CVM, NAT gateway, ENI, and HAVIP) at any time.
      Note:
      Only general BGP IP lines are applicable for the current common public IP addresses.
      For more details about EIPs, see IP Addresses.
      Item
      Public IP
      EIP
      Public network access
      ✓
      ✓
      Independent lifecycle
      ×
      ✓
      Bind/unbind anytime
      ×
      ✓
      Adjust bandwidth1
      ✓
      ✓
      Idle fee
      ×
      ✓
      Note:
      In the Public IP console, you can only adjust the bandwidth of EIPs. To adjust the bandwidth of public IPs, see Adjusting Network Configuration.
      EIPs can be decoupled from the lifecycle of the cloud resource and operate independently. For example, if you need to keep a certain public IP that is strongly associated with your business, you can change it to an EIP and keep it in your account.

      Rules and Limits

      Use Rules

      An EIP is applicable to instances in the basic network and VPC, and NAT gateway instances in VPC.
      When you bind an EIP with a CVM instance, the original public IP is released at the same time.
      When a CVM/NAT gateway instance is terminated, it will be disassociated from its EIP.
      For details on EIP billing rules, see Elastic IP Billing.
      For the step-by-step operations of EIPs, see Elastic IP.

      Quota

      Resource
      Quota
      EIPs/region
      20
      Daily purchase (times)
      Regional EIP quota * 2
      Public IPs assigned due to disassociation of EIPs/day
      10
      Note:
      By default, the EIP quota cannot be adjusted. You can free some quota by converging IPs in NAT gateway and Cloud Load Balancer.
      If you do need to adjust the quota, submit a ticket or contact your sales rep.

      Limits on public IPs bound to CVM

      Note:
      For CVM instances purchased before 00:00, September 18, 2019, the number of public IPs can be bound to each instance is equal to the number of supported private IPs.
      CPU cores
      Public IPs + EIPs
      1-5
      2
      6-11
      3
      12-17
      4
      18-23
      5
      24-29
      6
      30-35
      7
      36-41
      8
      42-47
      9
      ≥ 48
      10
      
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