Abstract: Now a day the technology is improving day by day. The wired network has been changed to wireless network. There are many advantages of wireless network over wired network. One of the main advantage is we can walk around freely in a network area and accesses internet. Security is one of the challenging issues. Intrusion Detection System is one of the systematic ways to detect malicious node in a mobile ad-hoc network (MANET) and it is driven by battery power. This paper gives a survey on various intrusion detection systems in MANET.

Keywords: mobile ad-hoc network (MANET), Intrusion Detection System (IDS), malicious, security.