Generate a valid, random TCP port.
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The minimum/maximum value to be generated. The minimum should not be below 49152 and the maximum should not exceed 65536 (see details).
The maximum number of times a random port will be searched for.
By definition, a TCP port is an unsigned short, and so it can not exceed 65535. Additionally, ports in the range 1024 to 49151 are (possibly) registered by ICANN for specific uses.
random_port() will simply generate a valid, non-registered
random_unused_port() will generate a port
that is available for socket connections.
random_open_port() finds a random port not already bound
to an endpoint.
"The Ephemeral Port Range" by Mike Gleason. http://www.ncftp.com/ncftpd/doc/misc/ephemeral_ports.html
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