Is ENABLE_SUBNET_DISCOVERY fully compatible with CustomNetworking/ENIConfigs?

[sidewinder12s]

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What happened:

Is the new ENABLE_SUBNET_DISCOVERY setting compatible with folks using CustomNetworking with custom ENIConfigs to specify pod secondary subnets? I couldn't find much in the issues about this other than some folks mentioning that you cannot use ENABLE_SUBNET_DISCOVERY with custom IP addressing settings for IP conservation/split subnet (host primary/pod secondary subnets)

Environment:

• Kubernetes version (use kubectl version): 1.29
• CNI Version: Latest
• OS (e.g: cat /etc/os-release): EKS AMI
• Kernel (e.g. uname -a): 5.10

[orsenthil]

Custom Networking is a separate feature over the solution for IP-exhausion with ENABLE_SUBNET_DISCOVERY

As we mention in our blog post - https://aws.amazon.com/blogs/containers/amazon-vpc-cni-introduces-enhanced-subnet-discovery/

Custom networking takes precedence when both features are enabled on the VPC CNI.

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