F5 Load Balancer HTTP request limit

Hello Everyone,

 

Hopefully someone will be able to help me. I am doing my final year project and I am testing 4 different load balancers and how they behave under increasing load. One of them is F5 LTM. I have a testbed in VM environment with the 4 LB's, HTTP traffic generator and a bunch of apache webservers. The issue I have is when I send the HTTP traffic over the F5 LB for some reason the request rate seems to be limited at around 80 req/s. Because of this I am unable to ramp up the load on the webservers. I tried to find a way around this with no success. I can only assume that this is because of some kind of inbuilt protection against DDOS that prevents the request increase. Any help would be appreciated.