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How to find your RWIN:
1) Open up a DOS Prompt box:
2) Type: ping -l #### dslreports.com
#### is your MSS. (MSS = MTU - 40)
Take your average large packet ping, multiply by 1.5, multiply that by your proposed advertised speed, and divide that value by 8. You now have your raw RWIN.
Example: 450ms average latency (x 1.5) with 53Kbps available downstream bandwidth:
450 x 1.5 = 675. 675 x 53kbps = 35775. 35775/8 = 4472 (RWIN).
3) To change the RWIN: