Black hole attack targets the network layer of the protocol stack by disrupting the routing service. In this type of attack, an adversary aims to disrupt the packets destined to a target node in the network. It achieves this by claiming that it has the freshest and shortest path to a target node. It then redirects all packets destined to a target node to itself and drops them. Dynamic Source Routing (DSR) is a Mobile Ad hoc Network (MANET) reactive routing protocol which establishes routes on demand and therefore more susceptible to black hole attack. This paper analyses the black hole attack on DSR-based MANET. The analysis is performed by simulating DSR-based network in NS-2 and introducing the black hole attack to the network. The graphs obtained from simulations indicate that DSR-based MANETs' performance deteriorates when black hole attack is launched against them.
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