Does Lambda@Edge support IPv6 connectivity?

Question

I'm trying to find a workaround to the lack of support for IPv6 Origins in CloudFront, as a way to possibly avoid paying for IPv4 addresses.
Can a Lambda@Edge function make HTTP(s) calls to EC2 instances that are using IPv6 addresses exclusively?

Giovanni Lauria · Answer

A Lambda@Edge function should be able to make HTTP(s) calls to EC2 instances using IPv6 addresses.

* Ensure the Lambda function is configured to use the latest Node.js runtime version which supports IPv6. Older versions may have issues.
* When making the HTTP request, specify the IPv6 address as the `hostname` and set the  `family`option to  `6` to force IPv6.

```
 var options = {
   hostname: 'xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx', 
   family: 6,
   //...
 };
```

* Make sure any security groups or network ACLs allow the relevant IPv6 traffic to reach the EC2 instance.
* Consider using an egress-only internet gateway to allow outbound IPv6 traffic from the instances without exposing them directly to the internet.
* Test connectivity from another IPv6-enabled resource first to verify the EC2 instance configuration before testing from Lambda.

Does Lambda@Edge support IPv6 connectivity?

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