Tcp Receive Window Size Auto-tuning
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How to Enable or Disable TCP Receive Window Size Auto-tuning in Windows
TCP receive window size auto-tuning is a feature that improves the performance of programs that receive TCP data over a network. It allows the operating system to dynamically adjust the size of the TCP receive window based on the network conditions and the application behavior. However, this feature may not be compatible with some older routers and firewalls that do not support it. In this article, we will show you how to enable or disable TCP receive window size auto-tuning in Windows.
What is TCP Receive Window Size
TCP receive window size is the amount of data that a receiver can accept from a sender before sending an acknowledgment. The larger the receive window size, the more data can be transferred without waiting for acknowledgments. This can improve the throughput and efficiency of data transfer, especially over high-latency or high-bandwidth networks.
However, if the receive window size is too large, it may cause congestion and packet loss on the network. Therefore, it is important to choose an optimal receive window size that matches the network conditions and the application requirements.
What is TCP Receive Window Size Auto-tuning
TCP receive window size auto-tuning is a feature that lets the operating system continually monitor the network conditions and the application behavior, and adjust the receive window size accordingly. It uses a scaling factor to increase or decrease the receive window size exponentially, depending on the available bandwidth, network delay, and application demand. This way, it can take advantage of any unused bandwidth and avoid congestion.
TCP receive window size auto-tuning was introduced in Windows Vista and later versions of Windows. It is enabled by default for most programs that use TCP for data transfer, such as web browsers, email clients, file sharing applications, etc. However, it is disabled by default for programs that use the Windows HTTP Services (WinHTTP) interface, such as Windows Update, Remote Desktop Connection, Windows Explorer (network file copy), and SharePoint (WebDAV).
How to Enable or Disable TCP Receive Window Size Auto-tuning in Windows
To enable or disable TCP receive window size auto-tuning in Windows, you need to modify a registry value called TcpAutoTuningLevel. This value configures the window scaling strategy for TCP connections. It can have one of the following values:
0 (TcpAutoTunningOff): This value disables the window scaling feature and limits the maximum TCP receive window to 65,535 bytes.
1 (TcpAutoTunningRestricted): This value enables window scaling but uses a conservative scaling factor.
2 (TcpAutoTunningNormal): This value enables window scaling and uses the default scaling factor.
3 (TcpAutoTunningExperimental): This value enables window scaling and uses an aggressive scaling factor.
The default value is 2 (TcpAutoTunningNormal), which means that TCP receive window size auto-tuning is enabled with the default scaling factor. To change this value, you need to follow these steps:
Open Registry Editor by pressing Windows + R keys, typing regedit in the Run dialog box, and clicking OK.
Navigate to the following registry key: HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters
Right-click on an empty space in the right pane and select New > DWORD (32-bit) Value.
Name the new value TcpAutoTuningLevel and double-click on it.
In the Value data box, enter one of the values mentioned above (0, 1, 2, or 3) and click OK.
Close Registry Editor and restart your computer for the changes to take effect.
Note: You can also use the netsh command-line tool to change this value. For example, to disable TCP receive window size auto-tuning, you can run the following command as an administrator:
```
netsh int tcp set global autotuninglevel=disabled
```
To enable it with the default scaling factor, you can run:
``` aa16f39245