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Elastic Network Adapter (ENA) Express

Definition

ENA Express is AWS's guest-networking feature that runs guest-originated TCP traffic over systems/srd on the underlying network. Announced Nov 2022. From the EBS retrospective: SRD "improves the performance of your TCP stacks in your guest" by "taking advantage of multiple network paths and reducing the overflow and queues in the intermediate network devices."

It is the canonical example of SRD being useful outside storage — a protocol first built for EBS ends up carrying generic EC2 TCP.

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