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I'm currently studing how OS assign ephemeral ports.
I know that years ago on application's requests, the OS used to open ephemeral ports progressively, but now due to a too easy detection for packet injection it has changed.

My question is, how the OS is currently choosing which ephemeral port to open? Is it still possibile a packet injection without brute forcing all the possible ports? (if yes, how?)

Thanks

Davide Ambrosi
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  • "_how the OS is currently choosing which ephemeral port to open?_" Different OSes do it differently, and, in fact, each could have a different port range for ephemeral ports. – Ron Maupin Mar 14 '19 at 17:56
  • Do you know in which file I can find that particular procedure in the Linux kernel? – Davide Ambrosi Mar 15 '19 at 07:10

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