In the current scenario Internet of Things (IoT) is playing a vital role in life’s betterment of mankind. The word “smart” is being utilized in almost every aspect of modern day’s life. From smart cities to smart grids, smart buildings to e- healthcare systems, smart cars to smart agriculture etc. the world is now becoming Internet of everything. According to research by Forrester, businesses will lead the surge in IoT adoption in 2019, with 85% of companies implementing or planning IoT deployments this year. Security and privacy has always been a crucial concern for any kind of computer communications and networks. When it comes to IoT the effects would even more hazardous since it involves small devices communication with sensing abilities without any human intervention. There are so many security threats in IoT environment which motivates the researchers to focus on and try to resolve in order to achieve greater results and new possibilities. The IoT based systems can be exploited by its inherent security vulnerabilities. Because IoT environment usually operates in a heterogeneous manner and it deals with interoperability issues also, it is very tedious task to design specific security mechanism. The resource constraint nature of the devices (Things) imposes additional overhead in order to develop an efficient solution for security related problems. We can consider security issues as a hurdle in widespread adoption of IoT devices. One vital security mechanism is Intrusion Detection System (IDS).