[stunnel-users] problem with buffering data on stunnel

Michal Trojnara Michal.Trojnara at mirt.net
Fri Jul 10 23:31:39 CEST 2015


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On 10.07.2015 20:17, wujot/Adalbert wrote:
> But unencrypted session on path between Stunnel server and hi-speed
> end server (both in LAN) is using TcpWindowSize on level 64KB -
> 131KB

Did you consider also tuning SO_SNDBUF of the sending application?

> (in Windows 2008 or newer it is calculated automatically). So I
> steel have at least 64KB buffer in stunnel.

IMHO Windows is probably not the best server platform...

> Is there any possibility to force stunnel to use on faster part of 
> connection (LAN side) the value of TcpWindowSize similar to
> calculated on slower part (on WAN side)?

I don't think such tricks are possible with BSD sockets.

BTW: You can also change BUFFSIZE in common.h and rebuild stunnel.

Best regards,
	Mike
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