NoteHKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\<interface-name>
| Data type | Range | Default value |
|---|---|---|
| REG_DWORD | 0x0 - 0x3FFFFFFF bytes | (See description.) |
Determines the largest TCP receive window offered by the system. The receive window is the number of bytes a sender can transmit without receiving an acknowledgment. This entry override's TCP's negotiated maximum receive window size and replaces it with the value of this entry.
TCP uses a receive window that is four times the size of the maximum TCP segment size (MSS) negotiated during connection setup up to a maximum size of 64 KB. TCP for Windows 2000 also supports windows scaling, as detailed in RFC 1323. Scaling enables TCP to provide a receive window of up to 1 GB.
For Ethernet networks, the default value of this entry is 0x4470 (17,520 or twelve 1460-byte segments). For other networks, the default value is 0xFFFF (65535) unless 0xFFFF is larger than:
and
Note
This entry determines the maximum receive window size for this interface. When configuring this interface, TcpWindowSize takes precedence over the value of GlobalMaxTcpWindowSize which establishes a maximum window size for all interfaces.
Windows 2000 uses windows scaling automatically if the value of TcpWindowSize is greater than 64 KB. To disable windows scaling, set the value of Tcp1323Opts to 0 or 2.
Windows 2000 does not add this entry to the registry. You can add it by editing the registry or by using a program that edits the registry.
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