IP Spoofing : How To

I have an application hosted on a Linux environment with Fedora OS. There is no web server in the architrecture. For the same application, I am doing the scripting directly from the controller which also acts as a Load Generator. As of now, I have to generate a load of 15 users. Since, IP spoofing is not enabled all the requests are going with the same IP and hence the script is not working fine.


I have to emulate the environment where multiple IP's are sending requests to the server. But I am not aware of how to do IP spoofing from the ground up. Can somebody assist me in this ?