[stunnel-users] problem with buffering data on stunnel

[Michal Trojnara]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

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
> 
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1
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=yBNM
-----END PGP SIGNATURE-----