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Re: SSH tunneling buffers...
- From: Brian Genisio <briangenisio at yahoo dot com>
- To: cygwin at cygwin dot com
- Date: Thu, 1 May 2003 08:31:13 -0700 (PDT)
- Subject: Re: SSH tunneling buffers...
- Reply-to: brian at genisio dot org
--- Igor Pechtchanski <email@example.com> wrote:
> On Thu, 1 May 2003, Brian Genisio wrote:
> > Hi all...
> > I am using SSH to tunnel (Using LocalForwarding ports) from one application
> > another. The system exists of a controller software in Linux (where the
> > server resides), and the actual software in Cygwin.
> > Cygwin connects to the Linux SSH server and sets up a port forward. The
> > app sends a small amount of data (about 12 bytes) 30 times per second.
> > The problem is that the Cygwin/SSH side of the tunnel is buffering the data
> > before it sends it to the Cygwin app. The result is the data is received
> > bursts, and the control is not fluid.
> > I have tried this system in a Linux to Linux situation, and the buffering
> > not happen. Also, I have tried sending data from Cygwin to Linux, and the
> > buffering does not happen. It only happens when data is being sent from
> > to Cygwin.
> > I have also tried switching between LocalForward and RemoteForward, and it
> > the dirction that matters, not the type of port forwarding.
> > Both sides sets the TCP_NODELAY flag before it starts sending, and I know
> > SSH code does the same...
> > Any ideas?
> > Brian
> Does "ssh -vvv" show anything that could be related to this?
Yeah, -vvv tells us that the TCP_NODELAY is being set.
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