Rsync over SSH v2 with strong authentication but not encrypted to get the highest speed on Rsync?

Jim Kleckner jek-rsync at
Wed Jan 15 18:48:00 EST 2003

Also, if any of the clients are windows clients, there is a known 
problem that the small packet sizes used by the common rsync versions 
cause some kind of massive performance problem that appears attributed 
to ssh or rsync.  Buffering patches dramatically speed up rsync.


Aaron Morris wrote:

> I do not believe there is a way to turn encryption off, however, you 
> might be able to use "blowfish" (or DES, if possible) as a cipher 
> instead of "3DES" which is much slower (and the default for SSH2 in 
> OpenSSH).  Also, make sure you are not using compression in rsync or 
> ssh, since it will increase CPU load as well.
> Boris Gegenheimer wrote:
>> Hello
>> I am trying to set up a backup server running Solaris 8 with rsync 
>> 2.5.5 and ipfilter the latest version.
>> The problem i have is i have about 16 different interfaces that are 
>> secured via ipfilter , and i tried running rsync via rsh but ipfilter 
>> would not set up a keepstate with rsh which meant i had to open up 
>> and that is not acceptable.
>> So what i tried then was via ssh and that worked fine but it was very 
>> slow and cpu heavy due to the encryption .
>> What i am asking is there some way to configure ssh and rsync to use 
>> strong authentication but drop the encryption so that it works faster?
>> Regards Boris

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