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Asked: 2012-01-06 10:36:29 +0800 CST

What is the fastest protocol for transferring small files between a high latency VPN?

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I have ~70ms latency over my VPN connection and need to set up a backup/replication system. SMB is the worst, with throughput ~200KB/s. SCP gives me ~400KB/s. HTTP ~700KB/s. The links are symmetric 50mbit connections.

Is there any kind of file transfer protocol designed for this kind of high latency connection?

Thanks.

file-transfer networking file-sharing

3 Answers

  1. If you already have a VPN in-place, then ftp might be a valid choice.

    A latency of ~70ms is not what I would call high though. SCP and http should perform far better then what you describe on a 50mb/s 70ms link. You may have some other problem. You might want to use iperf or something else that can test the raw capacity of your connection.

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  2. I'd use tar

    you can either create a tarfile and transfer it, or directly pipe the output throught netcat or similar tools.

    The advantage is that the protocol won't do a lot of file-open handshakes.

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  3. I would probably use scp or rsync and the arcfour cipher.

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