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Reliable multicasting takes help of re-transmissions from the source, to recover lost packets .This imposes a huge overhead on the bandwidth-constrained ad hoc network. In On Demand Multicast Routing Protocol (ODMRP), the multicast members send Join Replies to the periodic Join Queries initiated by the source, to maintain their membership. This paper presents a mechanism to selectively cache the packets with the Forwarding Group members. This effectively distributes the retransmission responsibility among intermediate nodes. Acknowledgments are sent in the form of bitmaps that are piggybacked on the Join Reply packets. Through this peripheral buffer based approach it is able to provide reliable multicast without any increase in control overhead.

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