Re: slow sFTP with SSHD

I'm not sure about the multithreading, I'm using WinSCP3 and I didn't
change any settings other than to use SSH2 and no compression. I'm glad
to hear that other people are finding that sFTP is slower which proves
to me that it's not just my system/setup...

For regular ftp I use WsFtp and it seems to be faster than when going
through SSH with WinSCP3. My comparison is from my home Ethernet
hardwired network so the internet and ISP's DSL speed should not affect
the tests. Regular ftp is definitely faster without all the encryption
work used for SSH. Seems like Nico Tripcevich is essentially doing the
same kind of tests and getting similar results.

Alan

"Hunt, Andrew" wrote:

> Does your FTP client use multithreading? Regards,
>
> Drew Hunt
> Security Analyst
> Hawaii Pacific Health
> ahunt@straub.net
>
> -----Original Message-----
> From: Alan Vinh [mailto:alanvinh@verizon.net]
> Sent: Friday, January 21, 2005 6:25 AM
> To: Secure Shell Discussions
> Subject: Re: slow sFTP with SSHD
>
> FWIW, I'm not running SSH through port 22 but do run it
> through a router and the local Zonealarm firewall using
> WinSCP. FTP runs a lot faster (over port 21) than SFTP
> through WinSCP. I believe the speed does slow down due to
> all the overhead of encryption/decryption. 150kbps seems
> similar to my results as I was also disappointed with the
> rate...
>
> Alan
>
> LQ Marshall wrote:
>
> > Another possibility you did mention is the possibility
> > your connection is being throttled somewhere. SFTP runs
> > on TCP/22 where FTP is TCP/20,21. Network admins may have
> > placed a throttle on TCP/22 since it is typically used for
> > "encrypted telnet". Just a guess... Running your benchmark
> > from the same host may not properly replicate the
> > problem. If possible run your test from a local physical
> > switch (somehow w/o possibility of
> > filtering/control/proxy). Would give you a more accurate
> > view, unless you know things about the network not
> > mentioned. Q
> >
> > ----- Original Message -----
> > From: Nicholas Tripcevich
> > To: ssh@erdelynet.com
> > Sent: Thursday, January 20, 2005 5:48 PM
> > Subject: slow sFTP with SSHD
> > SSH users---
> >
> > I've set up SSHD and Cygwin on a Win2000 pro
> > machine following the helpful directions on
> > Erdelynet.com.
> >
> > I need to connect to the serving machine from
> > another machine at my university campus. We have
> > very high bandwidth inside campus connections,
> > and I usually get 3-4 M/sec transfer speeds. I
> > was formerly using the not secure Windows IIS
> > ftp server and I can achieve these transfer
> > speeds with the current system and IIS.
> >
> > However, with the Cygwin SSHD setup I just
> > installed I'm not able to get more than 150k/sec
> > transfer speeds using sFTP and SSH2. I tried to
> > use SSH1 and it didn't connect (I'd rather have
> > the security of SSH2).
> >
> > I tried using both SSH Secure Shell client and
> > CoreFTP and both are very slow.
> >
> > I tested the setup in a couple of ways. First,
> > I'm able to download at speeds using IIS ftp
> > from another machine on campus, so it's not the
> > network card or my server hardware (a 500mhz P3
> > dell optiplex gx110). Second, I'm able to
> > download at high speeds on the LocalHost using
> > SSH Secure Shell client on the same server
> > machine (just to test to see if the Cygwin
> > config is the bottleneck).
> >
> > So the problem seems to lie somewhere with
> > either Cygwin SSHD, the network card.
> >
> > I'm surprised I'm the only one who has run into
> > this, but I searched the mail list archives to
> > no avail.
> >
> > Thanks very much---
> >
> > Nico Tripcevich
> >
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