Description

Mobile Adhoc Network is a continuously self-configuring, infrastructure-less network of mobile devices connected without wires. Each device in a MANET is free to move independently in any direction, and will therefore change its links to other devices frequently. In this, we introduce the new scheme Collaborative Contact based Watchdog ( CoCoWa) as a new scheme for detecting selfish nodes. A common technique to detect this selfish behaviour is network monitoring using local watchdogs. A node’s watchdog consists on overhearing the packets transmitted and received by its neighbours in order to detect anomalies, such as the ratio between packets received to packets being retransmitted. By using this technique, the local watchdog can generate a positive (or negative) detection in case the node is acting selfishly (or not). In this work, we propose an work based on the combination of a local watchdog and the diffusion of information when contacts between pairs of nodes occurs.