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Requirements for a good port randomization algorithm Minimize the predictability of the ephemeral port numbers used for future connections. (i.e., make it hard for an outsider to guess which port numbers will be used for future connections). Maximize the port reuse cycle. (i.e. avoid port number “collisions”). Avoid conflict with applications that depend on the use of specific port numbers. (i.e., don’t use for ephemeral ports those port numbers that may be needed by some applications) |