[stunnel-users] problem with buffering data on stunnel

Michal Trojnara Michal.Trojnara at mirt.net
Thu Jul 9 12:17:36 CEST 2015


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Hi Adalbert,

My guess would be:
  socket = l:SO_RCVBUF=2048
  socket = r:SO_SNDBUF=2048

Mike

On 09.07.2015 11:53, wujot wrote:
> I have a problem with transmission from LAN server, which use
> another server on LAN with running stunnel, to pass encrypted data
> to remote SSL clients if they are on very slow GPRS network. If
> server in LAN starts to transfer big amount of data to such slow
> remote client, stunnel is buffering data and slowly transmits them
> to the GPRS client. TCP Window on connection from LAN server to
> stunnel is big (64 - 131kB), and TCP Window on connection from 
> stunnel to slow client is small (about 5kB). And additionally
> stunnel is buffering data. So, server is finishing transmission in
> seconds, but in fact most of data are still in buffers of stunnel.
> And it makes a timeout problem (server is waiting for the
> confirmation from client if it received all data, but time between
> last byte sent from server and confirmation from client could be
> even several minutes).
> 
> So, stunnel is working in "store and forward" model. Is it possible
> to switch it to something like "cut through"? Or how to force
> stunnel to more synchronized transmission between client and
> server?
> 
> Regards,
> 
> Adalbert
> 
> 
> 
> _______________________________________________ stunnel-users
> mailing list stunnel-users at stunnel.org 
> https://www.stunnel.org/cgi-bin/mailman/listinfo/stunnel-users
> 
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