SSH tunneling buffers...

Thu May 1 15:23:00 GMT 2003

On Thu, 1 May 2003, Brian Genisio wrote:
> Hi all...
>> I am using SSH to tunnel (Using LocalForwarding ports) from one application to
> another. The system exists of a controller software in Linux (where the SSH
> server resides), and the actual software in Cygwin.
>> Cygwin connects to the Linux SSH server and sets up a port forward. The Linux
> 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 in
> bursts, and the control is not fluid.
>> I have tried this system in a Linux to Linux situation, and the buffering did
> 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 Linux
> to Cygwin.
>> I have also tried switching between LocalForward and RemoteForward, and it is
> the dirction that matters, not the type of port forwarding.
>> Both sides sets the TCP_NODELAY flag before it starts sending, and I know the
> SSH code does the same...
>> Any ideas?
> Brian

Brian,
Does "ssh -vvv" show anything that could be related to this?
	Igor
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