Re: 30GB file transfers using scp

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To: secureshell@securityfocus.com
Date: Thu, 2 Oct 2003 09:18:50 +0300 (EEST)

Rob,

> I would like to keep them off but the transfer speeds are around 600K/s
> using scp. Much too slow for the window of opportunity. The scp/ssh
> man pages state that blowfish is faster than 3des but when used, the
> destination server returns:
>
> pash-2.05$ /usr/local/bin/scp -p -c blowfish arc1db04.dbf
> root@172.21.230.11:/tmp
> Executing ssh2 failed. Command:' ssh2 -l root -x -a -o clearallforwardings
> yes -o passwordprompt %U@%H's password: -o nodelay yes -o
> authenticationnotify yes -o ciphers blowfish 172.21.230.11 -s sftp' System
> error message: 'Permission denied'

Do you only get the error message when specifying the Blowfish cipher?

I mean, do you get it if you explicitly specify the 3DES cipher, too?

SSH2 (both SSH Corp and OpenSSH) also includes support for the "arcfour"
cipher, which should be much faster than 3DES, too. If you don't get an
error message when explicitly specifying the 3DES cipher, try arcfour.

Which versions of SSH are you talking about, anyway? Are the client
and the server both running the same version of SSH?

> Can scp be configured to use no encryption for transfers?

Older versions of SSH could be configured to allow the "none" cipher
(not for transfers separately, but for _everything_ in a session, which
would pretty much eliminate the point of using SSH for anything). This
no longer appears to be the case in OpenSSH 3.7.1p2 (good riddance!).

> Is my only option to use rcp?

Probably not. I would try to find out what's breaking your scp first.

-- 
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