Mobile Ad hoc network (MANET) suffers from different security issues. Ideally, not all nodes in MANET cooperate in forwarding packets because of non-malicious intention. This node is called selfish node and it behaves so due to its internal state such as limited energy concerns. Selfish nodes drop packets and that harms the process of routes establishment and relaying packets. They usually have a dynamic topology such that nodes can easily join or leave the network at any time and they move around freely which gives them the name Mobile Ad hoc Networks or MANETs. They have many potential applications, especially in military and rescue operations such as connecting soldiers in the battle field or establishing a temporary network in place of one which collapsed after a disaster like an earthquake. In these networks, besides acting as a host, each node also acts as a router and forwards packets to the correct node in the network once a route is established. To support this connectivity nodes use routing protocols such as AODV (Ad hoc On-Demand Distance Vector) or DSR (Dynamic Source Routing). Mobile ad-hoc networks are usually susceptible to different security threats and selfish attack is one of these. In Selfish attack, a malicious node which absorbs and drops all data packets and routing packets makes use of the vulnerabilities of the on demand route discovery protocols, such as AODV

IDS, MANET, Security, Selfish node attack, DSR (Dynamic Source Routing), AODV (Ad hoc On-Demand Distance Vector)

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