Re: OpenSSH Using NONE as Cipher?
From: Darren Tucker (dtucker_at_dodgy.net.au)
Date: 12/10/03
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Date: Wed, 10 Dec 2003 20:59:58 GMT
In article <cb71bb60.0312100744.62bd31c0@posting.google.com>,
maldrich <maldrich12@hotmail.com> wrote:
>Hi,
>I am trying to use secure copy from one UNIX machine to another. scp
>is slow due to the encryption provided by ssh. I downloaded 3.7 and
>configured with the --with-none option, although when I try to pass
>the option, I get:
>No valid ciphers for protocol version 2 given, using defaults.
OpenSSH doesn't support --with-none (it's not in configure.ac and from
a quick grep of CVS, it doesn't seem to have ever been).
How slow is "too slow"? I can get ~700KB/s scp'ing to and from my old
170MHz SparcStation (although the CPU is the bottleneck here).
Some suggestions for speeding it up:
1) Use a fast cipher, eg blowfish or aes. The default v1 cipher is 3des
which is relatively slow.
2) Try enabling/disabling compression. On fast networks, compression is
normally slower.
3) Try recompiling OpenSSH, OpenSSL and zlib with different compiler
flags. In some cases this can make a difference (eg gcc -mv8 makes a
significant difference on a SPARC).
--
Darren Tucker (dtucker at zip.com.au)
GPG key 8FF4FA69 / D9A3 86E9 7EEE AF4B B2D4 37C9 C982 80C7 8FF4 FA69
Good judgement comes with experience. Unfortunately, the experience
usually comes from bad judgement.
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