Update the IP address types for your Application Load Balancer

You can configure your Application Load Balancer so that clients can communicate with the load balancer using IPv4 addresses only, or using both IPv4 and IPv6 addresses (dualstack). The load balancer communicates with targets based on the IP address type of the target group. For more information, see IP address type.

Dualstack requirements

• You can set the IP address type when you create the load balancer and update it at any time.

• The virtual private cloud (VPC) and subnets that you specify for the load balancer must have associated IPv6 CIDR blocks. For more information, see IPv6 addresses in the Amazon EC2 User Guide.

• The route tables for the load balancer subnets must route IPv6 traffic.

• The security groups for the load balancer must allow IPv6 traffic.

• The network ACLs for the load balancer subnets must allow IPv6 traffic.

Console

To update the IP address type

1. Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/.

2. On the navigation pane, choose Load Balancers.

3. Select the load balancer.

4. On the Network mapping tab, choose Edit IP address type.

5. For IP address type, choose IPv4 to support IPv4 addresses only, Dualstack to support both IPv4 and IPv6 addresses, or Dualstack without public IPv4 to support IPv6 addresses only.

6. Choose Save changes.

AWS CLI

To update the IP address type

Use the set-ip-address-type command.

aws elbv2 set-ip-address-type \
    --load-balancer-arn load-balancer-arn \
    --ip-address-type dualstack

CloudFormation

To update the IP address type

Update the AWS::ElasticLoadBalancingV2::LoadBalancer resource.

Resources:
  myLoadBalancer:
    Type: 'AWS::ElasticLoadBalancingV2::LoadBalancer'
    Properties:
      Name: my-alb
      Type: application
      Scheme: internal
      IpAddressType: dualstack
      Subnets: 
        - !Ref subnet-AZ1
        - !Ref subnet-AZ2
      SecurityGroups: 
        - !Ref mySecurityGroup