def __dp(self):
        """
        Get the I{default} port if defined in the I{options}.
        @return: A L{MethodSelector} for the I{default} port.
        @rtype: L{MethodSelector}.
        """
        dp = self.__client.options.port
        if dp is None:
            return None
        else:
            return self.__find(dp)
Get the I{default} port if defined in the I{options}.
        @return: A L{MethodSelector} for the I{default} port.
        @rtype: L{MethodSelector}.