AWS Global Accelerator IP Subnet Range not up to date in ip-ranges.json

Question

I have a public ALB with a WAF firewall attached to it and a Global Accelerator endpoint which forwards traffic to this ALB.
Now, I'd like to limit direct access to the ALB to IP Range of the AWS Global Accelerator range - so to start with, none can access directly the ALB if not via the GA endpoint.

I have created an AWS Lambda as per https://aws.amazon.com/blogs/security/automatically-update-aws-waf-ip-sets-with-aws-ip-ranges/ which downloads the https://ip-ranges.amazonaws.com/ip-ranges.json file and adds automatically all the IP Subnets that matches "service": "GLOBALACCELERATOR" to the WAF IPset for both IPv4 and IPv6.
The process works and the Lambda can successfully add the IP address range to the WAF IPSet, though when I configure a rule to Match/Count this IPSet, I'm not seeing any hits that matches these subnets.

The only way I got this to match was to add all the IP ranges which matches "service": "AMAZON" rather then "service": "GLOBALACCELERATOR".

This makes me believe that the https://ip-ranges.amazonaws.com/ip-ranges.json list is not updated with the correct IP Ranges for the GLOBALACCELERATOR.

Answer

Have you disable the Client IP Preservation at the Global Accelerator?[1] Disabled mine and I'm able to block my requests through GA to my ALB that has WAF. Created rule to explicitly block the GA IP Addresses.

```
Sampled request for metric Deny_GA
Source IP
13.248.102.152
Rule inside rule group
-
Action
BLOCK
```

References:
[1] Preserve client IP addresses in AWS Global Accelerator - https://docs.aws.amazon.com/global-accelerator/latest/dg/preserve-client-ip-address.html

AWS Global Accelerator IP Subnet Range not up to date in ip-ranges.json

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