[stunnel-users] problem with buffering data on stunnel

Sun Jul 12 21:21:32 CEST 2015

>Did you consider also tuning SO_SNDBUF of the sending application?

"Sending application" is a commertial product, which is servicing many other 
transmissions, so I can't adjust it to slow transmissions only. In fact this 
problem is becouse of different calculation of throughput on L and R side of 
stunnel, so in my opinion I have to find solution on this server.

>MHO Windows is probably not the best server platform...

You're right. I will try the same with stunnel on RedHat.

-----Oryginalna wiadomość----- 
From: Michal Trojnara
Sent: Friday, July 10, 2015 11:31 PM
To: stunnel-users at stunnel.org
Subject: Re: [stunnel-users] problem with buffering data on stunnel

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Hash: SHA1

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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