In Wireless Sensor Networks (WSNs) the major challenge is to provide efficient and reliable communication between source and destination, especially in industrial WSNs (IWSNs) with dynamic and harsh environments. Hence, a Reactive Efficient Routing (RER) is designed to improve the routing protocol to provide efficient packet delivery against the unreliable wireless links. Here Dynamic Source Routing (DSR) protocol is used in the proposed system and a special technique called biased back-off scheme used to find a robust guide path through which cooperative forwarding opportunities are more. So, the data packets are sent to the destination efficiently. Performance of RER is measured using four parameters Bit error rate, Packet delivery ratio, Throughput and Control overhead packet through simulation.