Re: Home Network Speed (ftp vs scp)

From: David Bolton (angoraspruce_at_hotmail.com)
Date: 12/29/03 

Date: Mon, 29 Dec 2003 04:24:14 GMT

P Gentry <rdgentry1@cablelynx.com> wrote:
> Buck Turgidson <jc_va@hotmail.com> wrote in message news:<TVDHb.18941$Fg.12239@lakeread01>...
>> I get about twice the throughput on my 10/100 network with ftp than with scp
>> (8.6 MB/s vs 4.6) transferring the same file.

[snip]
 
> SSH reads bytes from disk, encrypts them, _then_ sends them down the
> wire. Once received, the bytes read from the wire must be decrypted
> and returned to their original state before writing them to disk. Now
> the job is done.

In addition, it seems from my observations of tcpdump that SSH requires more
packets to send the encrypted info as opposed to plain text. Correct me if I'm
wrong, but my guess is that SSH will use at least double the packets, which
might account for your halved transfer rate.

Any experts who can clarify whether this is the case?

David

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