IPv4 Targets for Dual Stack Internet-facing Application Load Balancer architecture Further reading Diagram history

IPv4 Targets for Dual Stack Internet-facing Application Load Balancer

Publication date: June 23, 2022 (Diagram history)

This architecture shows how to enable IPv4 and IPv6 internet connectivity to your application using Application Load Balancers (ALBs). The ALB and target group instances continue using IPv4 for communication while supporting dual stack clients.

IPv4 Targets for Dual Stack Internet-facing Application Load Balancer architecture

Architecture diagram showing ipv4 targets for dual stack internet-facing application load balancer.

The following numbered items describe the key components in this architecture:

Configure your Amazon VPC ALB subnets for dual stack internet connectivity by adding the default routes for IPv4 and IPv6.
Deploy your dual stack internet-facing ALB, and select the dual stack ALB subnets in the Amazon VPC.
Your application stack remains unchanged with the dual stack added functionality for the application endpoints with ALB. The ALB and target group instances continue using IPv4 for communication.
The application clients query for the application name and receive the IPv4 or IPv6 address of the endpoint, based on their capabilities. For single stack customers, their stack determines the protocol to be used. For dual stack enabled clients, the operating system configuration determines the use of IPv4 or IPv6 for communication.
The clients open connections to the application endpoint, using either IPv4 or IPv6.
The ALB distributes traffic to the healthy targets in the target groups using IPv4 connections.

Diagram history

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Change	Description	Date
Initial publication	Reference architecture diagram first published.	June 23, 2022
Initial publication	Reference architecture diagram first published.	June 23, 2022
Initial publication	Reference architecture diagram first published.	June 23, 2022
Initial publication	Reference architecture diagram first published.	June 23, 2022
Initial publication	Reference architecture diagram first published.	June 23, 2022
Initial publication	Reference architecture diagram first published.	June 23, 2022
Initial publication	Reference architecture diagram first published.	June 23, 2022
Initial publication	Reference architecture diagram first published.	June 23, 2022
Initial publication	Reference architecture diagram first published.	June 23, 2022
Initial publication	Reference architecture diagram first published.	June 23, 2022
Initial publication	Reference architecture diagram first published.	June 23, 2022
Initial publication	Reference architecture diagram first published.	June 23, 2022
Initial publication	Reference architecture diagram first published.	June 23, 2022
Initial publication	Reference architecture diagram first published.	June 23, 2022
Initial publication	Reference architecture diagram first published.	June 23, 2022
Initial publication	Reference architecture diagram first published.	June 23, 2022
Initial publication	Reference architecture diagram first published.	June 23, 2022

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Document Conventions

IPv6-only internet

ALB with IPv6 targets