I know that windows have it since Windows XP. You ‘ll find places on the Internet telling you to change registry values to increase your window size, but depending on the Windows version you’re using, these changes will have no effect. On Cisco devices, you can adjust the the window size using the global configuration command, “ip tcp window-size”. First lets convert the TCP window size from bytes to bits. Today’s broadband networks are many orders of magnitude faster, as well as vastly more reliable. For backup operations to the IBM Spectrum Protect server, typically the server takes in data fast enough so that larger TCP receive windows do not cause the window size to … I am wondering whether Windows uses the concept of "Socket Buffer Size"? Then the sender stops and waits for the acknowledgement. But consider what happens on a network with very high latency and high bandwidth. To increase the window sizes to more than 64K, you need to enable window scaling. For 500 ms the maximum is 524 Kbits/sec. We can disable sliding then what next? Each device can only send packets in these relatively short bursts. So, the larger the window size, the less times the sender has to stop and wait for an acknowledgement, speeding things up. All other trademarks are the property of their respective owners. It’s available as an option in any modern TCP implementation. R. RytoEX. ; Type EnablePMTUBHDetect, and then press ENTER. Its TCP/IP Stack is still the same. Then device B validates all the packet-level checksums and sends an ACK packet that says everything was received correctly. Great article and as Sooraj has said, nicely articulated. The "InitialCongestionWindowMss" specifies the initial size of the co… In case of WAN connection, ACK is getting delayed from the server to the client because of latency in RTT of around 100ms. ; In the Value data box, type 1, and then click OK.; Quit Registry Editor, and then restart the computer. Name and email are required, but don't worry, we won't publish your email address. Client <<< From <<