Here is a new wrinkle on the "SFTP Slow" issue. When I SFTP to an SCO UnixWare machine (also running OpenSSH) across a 100 mbit network, I am able to transfer a 600MB file in about 55 seconds, which is only about three seconds slower than old fashioned FTP. That said, when I use any number of Windows SSH clients (WRQ, SSHWindows or PuTTY) to transfer that same file from either the Fedora 4 or UnixWare machines, the E/T is more like 560 seconds, ten times longer.
A TechSupport person from AttachmateWRQ (they merged earlier this month) told me that this was due to the extra overhead of encryption, and like as not, the two OpenSSH machines that gave me the 55 second timing were not performing encryption. Hmmm, I'm not so sure that I buy that explanation.
So, the question is, how do I prove that any one SFTP connection is being encrypted and which method of encryption is being used?