What's the ephemeral port range and how are ephemeral ports selected?

Solution In Progress - Updated -

Issue

  • What does net.ipv4.ip_local_port_range control?
  • What's the ephemeral port range?
  • How are ephemeral ports selected?
  • How does a RHEL system use the ephemeral port range?
  • How many outbound connections are permitted on a RHEL system?

Environment

Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9

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