AWS just recently announced the improved VPC networking for AWS Lambda functions. Simply speaking the improvement is made by that Lambda functions now uses AWS HyperPlane to connect to customers’ VPC instead of the individual ENI.
AWS HyperPlane is a distributed Network Function Virtualization platform that works at the VPC flow level, it tracks the source/destination of the network packets, and solves the consensus problems in real time. It powers the AWS services like EFS, NAT Gateway, NLB, Transit Gateway, PrivateLink now, and Lambda (soon).
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