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Sinkhole attack is one of the most severe wireless ad hoc network assaults. A compromised or malicious node advertises incorrect routing information to present itself as a particular node and receives all network traffic in a sinkhole attack. It modifies the hidden information, such as changes made to data packets, or removes them after receiving the entire network traffic to make the network more complicated. A malicious node attempts to collect protected data from all of its neighbors. Sinkhole attacks use vulnerabilities like maximizing the sequence number or decreasing the hop count to affect the efficiency of Ad hoc networks protocols like AODV . As a result, the path provided by the malicious node tends to be the best available communication path for the nodes. Sinkhole attack modifies sequence no in RREQ in DSR protocol.