bind() should not return -EADDRINUSE

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Attempting to establish a connection to a remote host using the same
local port, but a different remote port as the previous connection (
that is still in TIME_WAIT ) results in bind() returning -EADDRINUSE.
 By changing the remote port, you avoid the conflict with the other
connection that is in TIME_WAIT, but since the remote port is not
known when bind() is called, it incorrectly returns -EADDRINUSE.  This
check should not be done in bind(), but deferred until the remote port
is known in the call to connect(), or listen().

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