[ns] implemention malicious node in MANET over DSR

[anas]

I am doing some research to provide security to MANET. However, I am stuck by the way how to simulate one or more malicious node(s) in one  MANET scenario, such the nodes that drops the forwarding packets
intentively, or absorbs all packets to it, or duplicates the  forwarding packets. Is there any solution to this problem. 

thank you in advance