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Summary form only given. Service advertisement and discovery are important components for collaborative applications in mobile ad hoc networking (MANET) environment since they enable mobile communication and computing entities to provide services and associated data to peers and to be aware of and use the available services and data from peers. In this research, we design and implement a lightweight protocol for service advertisement and discovery based on a MANET multicast protocol ODMRP (on-demand multicast routing protocol). Service advertisement and discovery information is piggybacked in ODMRP routing control packets. NS-2 simulation results show that our protocol achieves the goal of service advertisement and discovery in mobile ad hoc networks with high successful data delivery ratio and low overheads.