SFTP Servers

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If the end use will be over the internet, test from an external host. In the same Railscast, when the author wants to copy files to the remote server same direction as the first example , he uses rsync: rsync -r. But again, you can do all those things in a shell after connecting with ssh, which is a prerequisite to using either scp or sftp.

The sftp command line interface was designed to be similar to the command. This means it's trivial for hackers to see what you're doing, including seeing your passwords. They have to be exchanged out-of-band for obvious reasons and authentication of the information in them performed by direct comparison with a local copy, again for obvious reasons. Registration is quick, simple and absolutely free.

SFTP File Transfer Protocol

Server Fault is dedicated to professional system and network administrators. End user and enthusiast questions are off-topic contact your system administrator or hire a professional to help you out. Please see the for more information. If you have a fast wide-area network you will find that sftp and scp are about the same speed, which is slow. They both suffer from performance problems in the underlying openssh. sftp vs scp With modern hardware, this is not due to encryption overhead, but rather due to problems with the openssh implementation - it implements its own internal windowing mechanism which breaks down on fast connections. These are well-documented, and patches are available to fix the problem. Patching either end of the connection can help; ideally you'd patch both ends. For more info and the patches, see at Pittsburgh Supercomputer Center. The patches have fixes for that too. Meanwhile, you will find that ftp is woefully insecure; it sends passwords in plain-text. So if you're scp'ing from Windows, and it seems slow, try a different client. Even with an unpatched openssh server, you can do much, much better with a different client. I'm not sure which are good clients, unfortunately. This was several years ago, and is hearsay, so I can't vouch for its accuracy. You are more likely to be limited by the speed of your network or disk than by the protocol. In the end the protocol should not be the limitation on speed, although older versions of ssh do have trouble with high latency links. Good to know that sftp vs scp defaults are now to have the patches installed, although it looks like redhat has explicitly decided against it. Also, Note that trans-atlantic latency isn't really all that much. Also, isn't the combination of latency and bandwidth that causes the issue. I'd use the protocol that provides the security you need first, then worry about throughput. That being said, you'll have to set up a test to find the real numbers. Everything above is just my opinion. If you're testing performance locally, set up a server on your network. If the end use will be over the internet, test from an external host.

So if your download aborts in the middle of a large file rysnc will be able to continue from where it left off when invoked again. Also, isn't the combination of latency and bandwidth that causes the issue? The initial port number default of 21 is used for authentication and passing any commands. Sending a File: scp index. So if you're scp'ing from Windows, and it seems slow, try a different client. You can see these protocols in action by. Otherwise you can read the man pages for scp and sftp man sftp to see how they work. Each operation is identified by a unique number assigned by the client, and servers response contains the same identifying number. As mentioned, on multiple invocations it will take advantage of data already transferred, performing very quickly and saving on resources. Use them at your own risk and at your own discression. It provides all the functionality offered by these protocols, but more securely and more reliably, with easier configuration.