Re: convenience question of new scp user
From: johan antwerp (johanwantwerp_at_excite.com)
Date: 06/25/03
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Date: 25 Jun 2003 12:43:11 -0700
Richard E Silverman <res@qoxp.net> wrote in message news:<m2wufcvkcb.fsf@darwin.oankali.net>...
> >>>>> "JA" == johan antwerp <johanwantwerp@excite.com> writes:
>
> JA> 1) If the power fails on my computer when I'm doing a very large
> JA> file transfer with scp, after a reboot and re-establishment of the
> JA> ssh session, can scp simply resume the file transfer where it was
> JA> left off
>
> No.
>
> JA> 2) can multiple connections be opened to increase the speed of the
> JA> scp file transfer?
>
> No, and multiple connections would not increase speed anyway.
>
> JA> 3) would these features depend only on the underlying protocols or
> JA> technology and not scp itself?
>
> Resumption would be an implementation feature of the scp program.
>
> JA> 5) what underlying protocols does scp rely on?
>
> scp uses an undocumented protocol which is essentially rcp. It has no
> security features itself, but is run over an SSH connection for security
> (i.e. scp actually runs the "ssh" program to connect to the remote side.
If resumtion would be an implementation feature of the scp program,
are you certain no one has implemented it yet? Is there a reason why
this has not been done?
I've used a program called "download accelerator plus" on windows
which seems to open multiple connections to increase file transfer
speed. I don't understand what DAP is doing. It would be interesting
to have a loose understanding of what DAP is doing and why scp would
not benefit from doing the same. Any information would be appreciated.
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