Abstract: Mobile ad hoc network (MANETs) is emerging research field of wireless network. MANETs is temporary network in which collection of node are connected in dynamic topology without any existing central administrator. Because of self infrastructure, different types of security threats are also increasing day by day. Black hole attack is one of the security threats against MANETs routing. Black hole is malicious node in which this malicious node claim itself that shortest path from source and destination but in actual it will all packet destroyed or dropped all packet after received from source. In this paper, we discussed black hole mitigation techniques which proposed by researchers. We have also studies about pros and cons of detection techniques as based on proactive and reactive routing in MANETs.

Keywords: mobile ad hoc networks, routing protocols, black hole attack, collaborative black hole attack, AODV, DSR.