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Comments on Why is 32768-60999 the default for local/ephemeral ports?

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Why is 32768-60999 the default for local/ephemeral ports?

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The local port range on my Arch Linux installation is 32768-60999 according to

cat /proc/sys/net/ipv4/ip_local_port_range

Wikipedia states that this range is "used by many Linux kernels" and the kernel documentation says it's the default range.

I'm especially interested in the reason for excluding ports 61000 to 65535 from use as local/ephemeral ports by default.

networking ports

posted 7 months ago

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7mo ago by Michael‭

Matthias Braun‭

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Expanded between 2.2 and 2.4 (1 comment)

Michael‭ wrote 7 months ago · edited 7 months ago

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One of the sources from the Wikipedia footnotes says that it had been 1024 through 4999 in kernel 2.2 and changed in kernel 2.4 to "32768 through 61000 if adequate kernel memory is available."

I don't know if this suggests a technical reason to limit the total number, or if they changed the range to get 7× the port numbers and decided that was enough not to change it again when RFC 6335 showed up in 2011.