Windows Increase TCP Initial Congestion Window size

• https://serverfault.com/questions/160690/is-it-possible-to-configure-the-initial-window-size-for-tcp-slow-start-on-window
• https://andydavies.me/blog/2011/11/21/increasing-the-tcp-initial-congestion-window-on-windows-2008-server-r2/

https://serverfault.com/questions/608060/windows-tcp-window-scaling-hitting-plateau-too-early (Not related)

1 Check Current Initial Congestion Window

netsh interface tcp show supplemental

10 이다.

2 Create Window Settings Template

netsh interface tcp set supplemental template=custom icw=46

3 Applying Template

netsh interface tcp set supplemental template=custom

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• https://www.speedguide.net/articles/windows-8-10-2012-server-tcpip-tweaks-5077

however it does not work in Windows 8.1, or Windows 10 workstation variants (read-only setting error).

To set using Powershell cmdlets (only available in server variants):

Set-NetTCPSetting -SettingName InternetCustom -InitialCongestionWindow 10