Web Reference: Aug 18, 2013 · I suddenly came across the term "ephemeral port" in a Linux article that I was reading, but the author did not mention what it is. What is an ephemeral port in UNIX? Jun 26, 2017 · As for ephemeral ports: The Internet Assigned Numbers Authority (IANA) suggests the range 49152 to 65535 (2 15 +2 14 to 2 16 −1) for dynamic or private ports. Many Linux kernels use the port range 32768 to 61000 Looking at the destination on the TCP/IP tuple as in the example you ask: udp 0 0 192.168.1.25:41136 61.216.153.106:123 You can see it is the current machine using an NTP service UDP ... May 20, 2024 · After digging a bit I found that it happens when we or the server (same behavior in both cases) closes the connection with an RST packet and we then reuse the same ephemeral source port shortly after (usually tens of seconds).
YouTube Excerpt: by Jeff Knurek At: FOSDEM 2020 https://video.fosdem.org/2020/UD2.120/
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