is your MSS. (MSS = MTU - 40) Example Screenshot Take your average large packet ping + 50%, multiply that by your proposed advertised speed and divide that value by 8. You now have your raw RWIN. Example: 400ms average latency (x 1.5) with 53Kbps available downstream bandwidth: 450 x 53kbps = 23850 divided by 8 = 2981 RWIN. Add the 50%, and you get 4471. 3) To change the RWIN:
