Server Load Balancer:Change the network type of an ALB instance

Network types

IP versions

Public IP address types

Limits

Limits on associating an Anycast EIP with an ALB instance:

The following table describes the regions where you can associate Anycast EIPs with ALB instances.

Impacts on billing

• ALB is billed on an hourly basis. If you use an ALB instance for less than 1 hour, the usage duration is rounded up to 1 hour. A change to the network type of an ALB instance immediately takes effect. After you change the network type of an ALB instance, you are charged based on the previous network type within the current usage duration, which is rounded up to 1 hour. For more information, see ALB billing rules.

• The following table describes the impacts of network changes on billing.

  Change	Scenario	Operation	Impact on billing	References
  Private IPv4 address to public IPv4 address	The ALB instance needs to provide Internet-facing IPv4 services.	Associate an EIP or an Anycast EIP with the ALB instance.	After you associate an EIP or an Anycast EIP with the ALB instance, you are charged Internet data transfer fees.	EIP billing Billing rules
  Public IPv4 address to private IPv4 address	The ALB instance no longer needs to provide Internet-facing IPv4 services	Disassociate EIPs or Anycast EIPs from the ALB instance.	After you change the network type, view the actual bill for billing details.	None
  Private IPv6 address to public IPv6 address	The ALB instance needs to provide Internet-facing IPv6 services	Enable Internet bandwidth for the IPv6 gateway.	You are charged for the Internet bandwidth.	IPv6 gateway billing rules
  Public IPv6 address to private IPv6 address	The ALB instance no longer needs to provide Internet-facing IPv6 services.	Disable Internet bandwidth for the IPv6 gateway.	After you change the network type, view the actual bill for billing details.	None

Prerequisites

An ALB instance is created. For more information, see Create an ALB instance.

Change the network type of an IPv4 ALB instance

Private IPv4 address to public IPv4 address

After you change the network type of an ALB instance from private IPv4 to public IPv4, you must assign EIPs or Anycast EIPs to the ALB instance. You are charged Internet data transfer fees for the EIPs or Anycast EIPs. For more information, see EIP billing and Anycast EIP billing.

1. Log on to the ALB console.

2. In the top navigation bar, select the region in which the ALB instance is deployed.

3. On the Instances page, click the ID of the internal-facing ALB instance that you want to manage.

4. On the Instance Details tab, find Network Type in the Basic Information section, and click Change Network Type on the right side of the private IPv4 address.

5. In the Change Network Type dialog box, select an IP address type, assign public IP addresses, and then click OK.

   • Assign EIPs

     1. Set IP Address Type to EIP.

     2. Select Purchase EIP from the Assign EIP drop-down list.

     Note

     • You must assign an EIP to each zone in the list.

     • If your service requires ALB to use an EIP that has a specific IP address, replace the EIP. To replace an EIP, you can add zones to associate the ALB instance with the EIP or remove zones to disassociate the ALB instance from the EIP. For more information, see Modify the configurations of ALB instances.

     • When you select Purchase EIP, take note of the following rules:

       • A change to the network type of an ALB affects services. The EIP that is assigned when you create the ALB instance is automatically released or disassociated from the ALB instance. Released EIPs cannot be restored.

       • You can view the details about an EIP in the EIP console.

       • The EIP uses the pay-as-you-go billing method and the pay-by-data-transfer metering method. The EIP uses BGP (Multi-ISP) lines and is protected by Anti-DDoS Origin Basic.

   • Assign Anycast EIPs

     For more information about the limits on and procedure for associating Anycast EIPs, see Associate Anycast EIPs with an ALB instance to enable access through the nearest access point.

     1. Set IP Address Type to Anycast EIP.

     2. Select Purchase Anycast EIP from the Assign EIP drop-down list, or select an existing Anycast EIP.

        Note

        • You must assign Anycast EIPs to all zones in the list.

        • If you select Purchase Anycast EIP, take note of the following items:

          • When you change an ALB instance from Internet-facing to internal-facing or release the ALB instance, the associated Anycast EIPs are automatically disassociated and released.

          • You can view the parameters of an Anycast EIP in the Anycast EIP console.

6. Return to the Instance Details tab to check the value of the Network Type parameter.

   It takes about 1 minute to apply the change. If the Network Type parameter on the Instance Details tab displays Public next to IPv4, the ALB instance has switched to an Internet-facing ALB instance.

Public IPv4 address to private IPv4 address

After an ALB instance switches to an internal-facing ALB instance, all public IP addresses are disassociated from the ALB instance. The DNS records of the ALB instance are also updated. Proceed with caution.

1. Log on to the ALB console.

2. In the top navigation bar, select the region where you want to create the ALB instance.

3. On the Instances page, click the ID the Internet-facing ALB instance that you want to manage.

4. On the Instance Details tab, find Network Type in the Basic Information section, and click Change Network Type on the right side of the public IPv4 address.

5. In the message that appears, check the impacts of the change and click OK.

6. Return to the Instance Details tab to check the value of the Network Type parameter.

   It takes about 1 minute to apply the change. If the Network Type parameter on the Instance Details tab displays Private next to IPv4, the ALB instance has switched to an internal-facing ALB instance.

Change the network type of a dual-stack ALB instance

Private IPv4 address to public IPv4 address

• For more information about how to switch from private IPv4 to public IPv4, see Change the network type of an IPv4 ALB instance.

• The following procedure shows how to switch to a public IPv6 address.

  Note

  After the network of an ALB instance switches from private IPv6 to public IPv6, Internet bandwidth is enabled for the IPv6 gateway. You can view the details in the VPC console. Internet bandwidth is billed and is automatically enabled or disabled based on the network type of the ALB instance. For more information, see IPv6 gateway billing.

1. Log on to the ALB console.

2. In the top navigation bar, select the region in which the ALB instance is deployed.

3. On the Instances page, click the ID of the internal-facing ALB instance that you want to manage.

4. On the Instance Details tab, find Network Type in the Basic Information section, and click Change Network Type on the right side of the IPv6 address.

5. In the Change Network Type message, check the impacts of the change and click OK.

   Note

   If the VPC where the ALB instance is deployed does not have an IPv6 gateway, you are prompted to create an IPv6 gateway. Create an IPv6 gateway in the console as prompted.

6. Return to the Instance Details tab to check the value of the Network Type parameter.

   It takes about 1 minute to apply the change. If the Network Type parameter on the Instance Details tab displays Public next to IPv6, the network of the ALB instance has switched to public IPv6.

Public IPv4 address to private IPv4 address

• For more information about how to switch from public IPv4 to private IPv4, see Change the network type of an IPv4 ALB instance.

• The following procedure shows how to switch to a private IPv6 address.

1. Log on to the ALB console.

2. In the top navigation bar, select the region where you want to create the ALB instance.

3. On the Instances page, click the ID the Internet-facing ALB instance that you want to manage.

4. On the Instance Details tab, find Network Type in the Basic Information section, and click Change Network Type on the right side of the IPv6 address.

5. In the Change Network Type message, check the impacts of the change and click OK.

6. Return to the Instance Details tab to check the value of the Network Type parameter.

   It takes about 1 minute to apply the change. If the Network Type parameter on the Instance Details tab displays Private next to IPv6, the network of the ALB instance has switched to private IPv6.

References

• Associate Anycast EIPs with an ALB instance to enable access through the nearest access point

• ALB billing rules

• EIP billing

• Anycast EIP billing

• IPv6 gateway billing

• Configure a CNAME record

• Associate an EIP protected by Anti-DDoS Pro/Premium with an ALB instance

• What types of EIPs can be associated with ALB instances?