NS2 is an opensource and useful tool and u can download the software from www.isi.edu/nsnam/ns . Apart from this tool TETCOS NETSIM is an useful tool with good technical support but it is a commercial tool. To simulate IDS in WSN u can use SENSYS tool which is specially designed for testing secutiy in WSN....... Hope this helps u...... My research topic is also IDS for WSN ........ and for which attacks have u created IDS?

Install MannaSim Patch  in NS-2.29 Version  For sensor network in NS-2, It is easy prefer FEDORA-18 rather than ubuntu

First you have to install NS-2.29 version

then you have to add Mannasim Patch

NS_3 is not a suitable candidate because of following reason

LIMITED support only 15 support forum

THE Sensor Simulation is not fully developed but it is there in NS-3 Package

The steps are to be shown live but it can't described if you are really interested attend SEASON - 14

we are going to have workshop in this regard, you get an in depth idea about ns-2 the details are follows

National Level Workshop on Simulation and Emulation of Self Organized Networks-SEASON - 2014

Hands on Session on NS-2

Manet

Vanet

Graph Generation and analysis

Routing Implementation in NS -2

Tcp Implementation in NS -2

Rto Implementation in NS -2

Registration Fee

Faculty Members : Rs 2,000

Research Scholar : Rs 2,000

P.G Scholar : Rs 1,800

Industry Delegates : Rs 5,000

Important Dates

Fest Date: 18- 09 - 2014 to 20- 09 - 2014

Last date for application reception 15- 09- 2014

For Installation of NS-2 refer "www.kecsong.wordpress.com"