Indicates how a packet's source TCP/UDP port number is to be compared. If the ipv6ExternProtocal object in the same row does not indicate TCP or UDP, this object has to be 'noOperator(0)' and cannot be changed while this row is active, i.e., the value of ipv6ExternStatus in the same row has the value 'active(1)'. 'noOperator(0)', which is the default value, means that no comparison is to be made with the source TCP/UDP port number. eq(3) means equal,range(5) means that it compares the port value between two numbers, so this operator needs 2 operands. One operand is the starting port number of the range which is ipv6ExternSrcPort1 object, and the other operand is the ending port number of the range which the ipv6ExternSrcPort2 object is in.