Please Note : Since the web site is not hosted by Microsoft, the link may change without notice. How to Adjust TCP Window Size to Improve Network Performance You can do that by editing the registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\AFD\Parameters\DefaultSendWindow You ‘ll find places on the Internet telling you to change registry values to increase your window size In all recent Microsoft Windows implementations, windows scaling is enabled by default. The maximum throughput of a single connection depends on:.Check firewall settings and ensure traffic restrictions are turned off.
Please try the following suggestions to see if it could be of help. I have seen this quiet often with iperf the there is rise with the second packet and it is falling down to about 1 Mbit/s. Here test results from iperf no adjustment to TCP Window sizeīin/iperf.exe -c 10.150.250.157 -P 1 -i 1 -p 5001 -f m -t 10Ĭlient connecting to 10.150.250.157, TCP port 5001 We have found a hotfix which sounded like a solution but is not applicable but somehow it is not applicable to our systems. When testing with iperf and setting the tcp window size to about 425 we are recieving the rented bandwidth.
We have been analysing this problem for quiet some time and come to the conclusion that there is an issue with "tcp window scaling" of our window r2 2008 server, our windows 7 clients and windows 2012r2 (latter is a test system in Hongkong). The tunel is stable and the latency is about 180 ms. Through this line we have two firewalls connected via an ipsec vpn tunel. We have rented a high bandwidth low latency line between Zürich (Switzerland) and Hongkong.
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