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Re: Windows users! Help us test upload performance tuning?

From: Gisle Vanem <>
Date: Sat, 4 Aug 2018 09:38:50 +0200

Daniel Jeliński wrote:

>> Besides the 'test' data-file gives the wrong picture under
>> a VPN-connection. With PPTP/L2TP compression
> I believe VPN operates on a lower level than TCP, so send buffer usage
> will not be affected by VPN compression. But you could see speeds
> faster than what your ISP advertises, which is kind of nice.

Some VPN uses UDP (IPsec, port 4500) and the send-buffer
Winsock provides to them. So maybe this generator command gives
a better picture:
   openssl rand -out %TEMP%\curl-test 1048448

But I guess we cannot assume everybody have OpenSSL installed.

Received on 2018-08-04