AW: [e2e] overlay over TCP

[Michael Welzl]

> -----Ursprüngliche Nachricht-----
> Von: end2end-interest-bounces at postel.org
> [mailto:end2end-interest-bounces at postel.org]Im Auftrag von Jeroen Massar
> Gesendet: Montag, 24. Jänner 2005 18:59
> An: mallman at icir.org
> Cc: Randall Stewart; end-to-end list; Joe Touch
> Betreff: Re: [e2e] overlay over TCP
>
>
> On Mon, 2005-01-24 at 12:39 -0500, Mark Allman wrote:
> > > The way the PORT command is spec'd, it almost looks like you could
> > > initiate a transfer remotely from a separate machine (A tells B to
> > > send a file to C) too. (anyone know whether that's possible? ever
> > > implemented?)
> >
> > Yep.  That was a "feature".  And, it has been implemented in at least
> > the BSD FTP clients/servers.  Some claim that this is a security problem
> > and so the feature might be disabled by this point.
>
> It is a great feature, especially a couple of years ago, now with most
> people having DSL it isn't that worthwhile, though it still has a great
> value as you can use a slow line to transfer files between two
> 'highspeed' servers, or better said, not going over your slow line.
> Generally people will call this FXP btw.
>
> Most servers supporting it nicely have it disabled per default but one
> can turn it on.

Hmm, so it looks like they re-invented this feature for GridFTP:
http://www.globus.org/datagrid/gridftp.html

(the feature list contains "Third-party (direct server-to-server)
transfers").

Then again, the PORT command is in the "commands used by GridFTP" list
in http://www-fp.mcs.anl.gov/dsl/GridFTP-Protocol-RFC-Draft.pdf
so perhaps they turn it on and simply use the PORT command?

I think that this is said to be one of the most important features
GridFTP has...

Cheers,
Michael