Modify the congestion control window value

Question

For my research, I would like to manually control the congestion control window size of TCP.

I want to explicitly stop the window from being reduced when segment/ack loss occurs on a test network.

Is this possible at all?

I have been looking into ways of doing this using Python, Netem and Scapy. I have access to both windows and linux (ubuntu 12).

Answer 1

On kernels upward of 2.6.33 you can try

ip route change default via x.x.x.x initcwnd new-val initrwnd new-val

Also take a look at this