├── README.md └── LICENSE /README.md: -------------------------------------------------------------------------------- 1 | # AWS Services That Do Not Support IPv6 2 | 3 | Now that AWS [is charging per IPv4 address](https://aws.amazon.com/blogs/aws/new-aws-public-ipv4-address-charge-public-ip-insights/) as of February 2024, suddenly lack of IPv6 support has economic consequences for AWS customers. Thus, the reason for this page is to highlight IPv6 gaps across AWS's service offerings. 4 | 5 | | Service | Corey's Commentary | 6 | | ---- | ---- | 7 | | VPC Reachability Analyzer | Networks break; if you want to figure out why, you'd best be using an IPv4 stack. Even AWS doesn't know how to charge you to fix your IPv6 problems... | 8 | | Load Balancers | Yes, these support IPv6 in dual-stack configuration--but the price of each of these just went up by $3.50 a month for every AZ they have a listener hanging out within. Network Load Balancers don't listen on UDP if they're set to dual stack, Classic ELBs only support IPv6 if they're in the now-deprecated EC2 Classic, and Application Load Balancers seem... mostly okay? Gateway Load Balancers have no use case that I have discovered yet. Yes, I know, today almost nobody needs a pure IPv6 load balancer, but the future is coming.| 9 | | Gateway Endpoints | If you want the only two services that offer gateway endpoints in private Subnets (S3 and DynamoDB) to continue to not incur significant charges when passing through a Managed NAT Gateway, these things need to support IPv4 to get you there; in an IPv6 only environment you theoretically don't need these as NAT isn't a concern, but in dual-stack environments I feel like a lot of stuff is going to bias for the 4.5¢ per GB option rather than the free one. | 10 | | EC2 Instance Connect | EC2 Instance Connect doesn't support IPv6, full stop. That means that for this to work you've gotta use IPv4, and also get yourself into the privately-addressed range via VPN, Direct Connect, Arcane Prayers, etc. | 11 | | Auto Scaling Groups | Auto Scaling Groups can only register/de-register instances to target groups via 'instance-id' and not 'ip-address', and 'instance-id' only supports IPv4 targets. | 12 | | Systems Manager | The SSM Agent requires IPv4 access to Systems Manager endpoints in order to function | 13 | | Kinesis/SQS | Examples of possible high volume AWS services, not supporting IPv6. Requiring you to make the trade of between paying \$3.50 a month for every ec2 instance using it, or spawning a VPC endpoint at \$10.50 a month for every AZ and \$0.01 per GB. And do not forget to update all your code/config to use these new endpoints. | 14 | | App Runner | No option to select IPv6. Defaults to IPv4. | 15 | | Amazon EKS | Security groups for Pods can't be used with clusters configured for the IPv6 family that contain Amazon EC2 nodes. | 16 | | App Runner | No option to select IPv6 for ingress. Defaults to IPv4. No support for IPv6 VPC connectors. | 17 | | API Gateway | IPv4 only (for incoming requests; for HTTP proxy requests; for VPC links) | 18 | | ECR (public and private) | No IPv6 endpoints to pull from, so you need IPv4 for your 17+ services that run containers | 19 | | Cloudfront | Cannot pull from IPv6 origins, so your origin *must* be available via public IPv4 | 20 | | AppSync | GraphQL endpoints are IPv4-only | 21 | | ClientVPN | Currently the Client VPN service does not support routing IPv6 traffic through the VPN tunnel. | 22 | | Lambda | Lambda's execution environment does not support IPv6 at all. Neither "naked" nor in-VPC Lambda function can connect to IPv6 targets, with [some customers even migrating away from Lambda](https://twitter.com/tim_nolet/status/1696206569090789416) | 23 | | Almost all of them! | >90% of AWS service API endpoints to do not support IPv6 at all, so they cannot be used by AWS CLI, SDKs etc. from an IPv6-only VPC.
Some services support separate "dualstack" endpoints that require [special configuration](https://docs.aws.amazon.com/sdkref/latest/guide/feature-endpoints.html) (also known as Coward's Endpoints).
Some services support IPv6 only in select regions, like EC2.
Only 3% of service endpoints support True IPv6™ by default.
For a complete list, see [this map](https://awsipv6.neveragain.de). | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Creative Commons Legal Code 2 | 3 | CC0 1.0 Universal 4 | 5 | CREATIVE COMMONS CORPORATION IS NOT A LAW FIRM AND DOES NOT PROVIDE 6 | LEGAL SERVICES. DISTRIBUTION OF THIS DOCUMENT DOES NOT CREATE AN 7 | ATTORNEY-CLIENT RELATIONSHIP. CREATIVE COMMONS PROVIDES THIS 8 | INFORMATION ON AN "AS-IS" BASIS. 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