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

Solution Verified - 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?
  • Understanding the default ephemeral port allocation mechanism and range configuration in the Linux kernel.

Environment

Red Hat Enterprise Linux (RHEL) 6.
Red Hat Enterprise Linux (RHEL) 7.
Red Hat Enterprise Linux (RHEL) 8.
Red Hat Enterprise Linux (RHEL) 9.
Red Hat Enterprise Linux (RHEL) 10.

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