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Friday·28·January·2011

Cool new feature in OpenSSH 5.7: scp between two remote hosts //at 02:55 //by abe

from the always-wanted dept.

Just a few days after OpenSSH 5.7 was released upstream, our (Debian’s as well as Ubuntu’s) tireless OpenSSH and GRUB maintainer Colin Watson uploaded a first package of OpenSSH 5.7 to Ubuntu Natty and to Debian Experimental.

Besides the obvious new thing, the implementation of Elliptic Curve Cryptography which promises better speed and shorter keys while staying at the same level of security, one other item of his changelog entry stuck out and caught my attention:

  • scp(1): Add a new -3 option to scp: Copies between two remote hosts are transferred through the local host.

That’s something I always wondered why it didn’t “just work”. While it still doesn’t seem to detect such a situation by default, it’s now at least possible to copy stuff from on remote box to another without ugly port forwarding and tunneling hacks.

Further cool stuff in the changelog:

  • sftp(1)/sftp-server(8): add a protocol extension to support a hard link operation. It is available through the “ln” command in the client. The old “ln” behaviour of creating a symlink is available using its “-s” option or through the preexisting “symlink” command.

Colin++

Comments

Re: Cool new feature in OpenSSH 5.7: scp between two remote hosts

Posted by: Tech33
Website: 
Time: Fri, 28 Jan 2011 15:21

I thought we've been able to scp between remote hosts for awhile now. I have OpenSSH 4.3p2 on my CentOS host. I scp'd between two remote hosts without ever 'going through' my own host. I guess I don't understand your point.

Reply

Re: Cool new feature in OpenSSH 5.7: scp between two remote hosts

Posted by: Aaron Toponce
Website: http://pthree.org
Time: Fri, 18 Feb 2011 03:39

I've always wondered why OpenSSH didn't support elliptic curve cryptography. I'm stoked to create ECC keys, and get them to replace my existing RSA keys. Should be able to put that in my config as my preferred encryption algo as well. Good times.

@Tech33- It's more than just copying a file between two remote hosts. It's the ability to bring that file through your local client as well.

Reply

Re: Cool new feature in OpenSSH 5.7: scp between two remote hosts

Posted by: research paper
Website: http://iresearchpapers.com/freeinquiry.php
Time: Sun, 13 Mar 2011 20:03

I'm happy that this program have new options. I'll sharing with my friends this news.

Reply

Re: Cool new feature in OpenSSH 5.7: scp between two remote hosts

Posted by: resumes
Website: http://cvresumewriters.com/
Time: Fri, 18 Mar 2011 17:47

Coooooool. It's really useful.

Reply

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This is the blog or weblog of Axel Stefan Beckert (aka abe or XTaran) who thought, he would never start blogging... (He also once thought, that there is no reason to switch to this new ugly Netscape thing because Mosaïc works fine. That was about 1996.) Well, times change...

He was born 1975 at Villingen-Schwenningen, made his Abitur at Schwäbisch Hall, studied Computer Science with minor Biology at University of Saarland at Saarbrücken (Germany) and now lives in Zürich (Switzerland), working at the IT Support Group (ISG) of the Departement of Physics at ETH Zurich.

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