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scp works well in all cases, but the Raspberry Pi is to weak to copy files efficiently in a secure environment (lan). The theoretically possible 6,75 MB/s via 54 Mbit wireless lan shrink down to about 1.1 MB/s.

Is there a way to copy files remotely without encryption?

It should be a cli command with no dependencies to extra services (ftp, samba) or at least with a minimum of configuration. I mean, a standard tool that works quite well out-of-the-box with standard programms/services (like scp/ssh).

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"without any dependencies" is virtually not possible. you will always need a program that "listens" on one side (like the ssh/sftp server when using scp) –  umläute Feb 3 at 12:00
What about netcat? –  yegorich Feb 3 at 12:01
Okay you're right. I will change the requirements –  ManuelSchneid3r Feb 3 at 12:01

3 Answers 3

up vote 6 down vote accepted

You might be looking for rcp, it performs remote execution via rsh so you will have to rely on that and have in mind that all communication is unsecure.

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You cannot disable encryption completely on ssh/scp but you can force it to use a weaker cipher that is much less cpu intensive. Make sure that compression is not turned on in your ssh_config or on the command line and add -c arcfour,blowfish-cbc to your scp command line to select weaker ciphers.

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This is a nice idea. Is this possible for host specific config? (.ssh/config) –  ManuelSchneid3r Feb 3 at 17:27
@ManuelSchneid3r: Yes: under a Host section in your ssh_config, use Ciphers arcfour,blowfish-cbc to mirror the above -c switch. However, if your CPUs support the AES-NI instruction set, I'd try switching to aes128-gcm@openssh.com (yes, that's the cipher name, including the @ stuff), which will use the blazingly fast (with AES-NI) AES128-GCM. –  Reid Feb 3 at 17:51

I think NFS is quite underrated for this sort of task, where you want convenience, speed and don't care about security. NFS is really simple to set up, especially on the client: see this guide for ubuntu. From the client's perspective you just mount the server directory and it looks just like a local drive and you can use cp or rsync or whatever commands you want.

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