> Can i use the tunneling feature of ssh without using encryption
> (Performance) or weak encryption. If so, could yougive me a tip ?
Yes, it is possible. Configure ssh with "--with-none" to allow the
"no encryption" cipher, and then connect using "ssh -c none host".
This is a very bad idea.
In order to gain any performance benefits from not using encryption,
your computers must be really shitty and old and you will have compiled
ssh without any compiler optimisation at all.
I thought I had it bad when a SGI Indigo2 running at 200 MHz couldn't
fill its 10 Mbps Ethernet when displaying some seriously heavy graphics
through ssh-forwarded X to another workstation. Then I recompiled ssh,
inlining all I could and applying all other optimisations that didn't
break the functionality (-O3 on SGI breaks sshd, the keys don't work
anymore).
The code is a bit bigger (sshd something like 600k against 400k), but
maybe twice as fast now as far as encryption goes. This estimate is
based on running the same code on another Indigo2 connected to ATM
(155 Mbps), so the network is not a bottleneck, and the other end
is a fast PC (Celeron 433) running Linux, connected to 100 Mbps
Ethernet. Scp'ing large files using the Blowfish cipher became twice
as fast as before. No more worries :)
--
Atro Tossavainen (Mr.), Systems Analyst - email at URL - +358-9-850-111-86
Institute of Biotechnology, University of Helsinki, Finland
My opinions may freely be shared by my employers if they want to.
< URL : http : / / www . iki . fi / atro . tossavainen / >
