Amit Saha • 8/14/2018

AWS Network ACLs and ephemeral port ranges

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This technical article details a troubleshooting scenario where intermittent connectivity from Docker containers to a service was caused by a mismatch between the operating system's ephemeral port range and the allowed outbound ports in AWS Network ACLs. It explains the concepts of ephemeral ports, AWS NACL rules, and Docker's NAT behavior, providing a clear diagnostic path and solution for this infrastructure problem.

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#networking #aws #docker
AWS Network ACLs and ephemeral port ranges

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