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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++

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Debian GNU/Linux is my favourite Linux distribution, being stable, flexible, consistent and having a great community. Although I'm not the biggest bug report writer, I try to contribute by staffing the Debian booth at events, carrying the necessary hardware there or even organising the whole booth.


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