Configuring EC2 + ELB as IPv6 only

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Hello: Is it viable to configure a (webserver) EC2 + ELB with IPv6 stack-only? What would happen with those clients that don't have IPv6 yet? Since IPv4 are getting more expensive now, we would like to migrate our resources to IPv6 only, but I'm not sure if this would work as a general solution... I would appreciate any help or comment on this.

Thanks

asked 10 days ago296 views
1 Answer
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Hello.

EC2 can be changed to IPv6 only.
https://aws.amazon.com/jp/blogs/networking-and-content-delivery/introducing-ipv6-only-subnets-and-ec2-instances/

However, ALB cannot be configured for IPv6 only as of May 2024, so it will be a dual stack configuration using IPv4 and IPv6.
In other words, you cannot erase public IPv4 when using ALB.
https://docs.aws.amazon.com/elasticloadbalancing/latest/application/load-balancer-ip-address-type.html
https://repost.aws/knowledge-center/elb-configure-with-ipv6

What would happen with those clients that don't have IPv6 yet?

I think it is possible for IPv4-only clients to access the application if the ALB is dual stacked.

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