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Please allow reverse DNS for EC2 IPv6

2

Currently AWS offers setting of reverse DNS names for EC2/VPC IPv4 addresses, although the process is conflated with enabling outgoing SMTP permission for those addresses. This post/question is to allow the same for IPv6 addresses.

There are two obvioud ways that AWS could do that:

  • A (simplistic): Allow setting reverse DNS names for individual IPv6 addresses using the existing form for IPv4 addresses. This is procedurally simple, but requires AWS to run some massive IPv6 rDNS zones covering the entire AWS EC2 IPv6 address space.
  • B (flexible): Provide a form where EC2/VPC customers can request delegation of reverse DNS for their assigned /56 IPv6 subnet, this delegation could be to any set of DNS servers, including but not limited to Route 53. This would only requre AWS to run delegation-only IPv6 rDNS zone for the AWS EC2 IPv6 address space, but would require a third form to unlock outgoing SMTP traffic.
4 Answers
1

Hi !

Thanks for contacting AWS Re:post .

I understand you would like to have reverse DNS names enabled for EC2 / VPC IPv6 .

I do apologize for the inconvenience of the Service limitation, However, as I understand the importance of your use case I have created a feature request on your behalf for this functionality. As you can imagine, any new feature requires the product to undergo rigorous testing and troubleshooting before it is made available, to ensure security and stability for end users. Hence, I can't provide you with an ETA for when the feature will be released, however if it's released, it should be announced in the AWS What's New blog below:

https://aws.amazon.com/new/

SUPPORT ENGINEER
answered 5 months ago
0

Hi !

Further adding, this doc explains setting PTR record (reverse DNS) for IPv6 as well : https://aws.amazon.com/premiumsupport/knowledge-center/route-53-reverse-dns/

SUPPORT ENGINEER
answered 5 months ago
0

That route 53 article reflects that AWS EC2 still doesn't allow rDNS for EC2 IPv6 address space, which is frankly embarrassing.

answered 5 months ago
0

I run hosting platforms like Plesk and Cpanel on AWS and the inability to set reverse DNS for IPv6 addresses prevents them from being used for mail servers completely. It's already good practice to set a proper reverse dns entry for mail servers but Google especially rejects all mails from IPv6 addresses without a reverse entry. Please add my vote for a feature request too.

answered 2 months ago

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