Bug 986

Summary: scp: support for "proxy mode"
Product: Portable OpenSSH Reporter: Sascha Silbe <sascha-openssh-bugs>
Component: scpAssignee: OpenSSH Bugzilla mailing list <openssh-bugs>
Status: CLOSED FIXED    
Severity: enhancement CC: markus
Priority: P2    
Version: 3.9p1   
Hardware: All   
OS: All   

Description Sascha Silbe 2005-02-23 04:18:00 AEDT 
I frequently need to copy files between hosts that cannot connect to each 
other (different private network, firewall, etc.). There's a third host (my 
working machine usually) that can connect to both of them (let's call it 
proxy host), so I use scp on that host to do the copying.
Currently, I have to copy the files from the source host to the proxy host 
and then from the proxy host to the target host using two different scp
invocations because scp tries to be smart and connect directly from the
source host to the target host.
It would be great if scp had a "proxy mode" where it connects both to the
source host and the target host, just passing through the files.
Comment 1 Damien Miller 2006-04-17 23:26:06 AEST 
I don't think any of the developers have a desire to add this sort of feature to scp (it is essentially unmaintainable), but if you would prefer to add it to sftp then please raise another bug.
Comment 2 Darren Tucker 2006-10-07 11:38:45 AEST 
Change all RESOLVED bug to CLOSED with the exception of the ones fixed post-4.4.
Comment 3 Sascha Silbe 2011-01-31 00:09:52 AEDT 
FWIW this has since been implemented and included in OpenSSH 5.7.

From http://openssh.org/txt/release-5.7:
 * scp(1): Add a new -3 option to scp: Copies between two remote hosts
   are transferred through the local host.  Without this option the
   data is copied directly between the two remote hosts.
Comment 4 Markus Friedl 2011-01-31 05:15:10 AEDT 
implemented for bug #1837 by adding of the -3 option to scp(1)