Cellular networks consist of a wired backbone, which connects the base-stations. The mobile nodes can only communicate over a one-hop wireless link to the base-station; multi-hop wireless links are not possible. By contrast, a MANET has no permanent infrastructure at all. All mobile nodes act as mobile routers. A MANET [2] is highly dynamic. Links and participants are often changing and the quality of the links as well. Furthermore, asymmetric links are also possible. New routing protocols are needed to satisfy the specific requirements of mobile Ad hoc networks. There exists a large family of ad hoc routing protocols