There is a package called XDIR from Lawrence Livermore Labs. Here is
the link:
ftp://coral.ocf.llnl.gov/pub/ia/llnlxdir/latest_xdir.tar.Z
http://www.llnl.gov/ia/xdir.html
It will do the third party transfers but does require Motif for
compilation. It may or may not work with Mesa, I have no idea.
Dow
"Michael H. Warfield" wrote:
>
> On Tue, Feb 22, 2000 at 04:50:31PM -0500, Jeff Hubbs wrote:
> > Okay - then why does FTPing with a browser work through our proxy server but
> > FTP clients don't, no matter how we configure them with proxy server info?
> > (granted, you probably aren't in a position to answer that, but we've never
> > received a satisfactory answer from the people who run our proxy server
> > either)
>
> Oh that's simple...
>
> Most stock ftp clients default to "port mode" while most browser
> based ftp clients default to "passive mode". If you are using a fairly
> recent version of an ftp client, try typing "passive" right after connecting
> and logging in or running the command "pftp" instead of "ftp" (that's
> passive ftp).
>
> In "port mode", the ftp server must be able to connect back to the
> client on the client specified port in order to transfer data. That
> data connection includes things like directory listings as well as getting
> and putting files. Most filtering firewalls and a lot of proxy firewalls
> block these sorts of connections.
>
> In "passive mode", the ftp client makes all the connections to the
> server and the server just listens for connections. The server never needs
> to connect back to the client for any data connections.
>
> There is a lot of history behind passive vs port mode and some
> really WEIRD design decisions for those two modes. The RFC actually
> allows for a "three body transaction" where a client establishes two
> control connections to two separate servers. It uses passive to one
> server to get a server port and issues a port command to the other
> server with the results from the passive command. It can then issue
> a "RETR" command (get) to one server and a "STOR" command to the other
> server. The file is then transferred directly between the two servers
> without going through the client! Do any ftp clients actually impliment
> this? Not that I've ever seen. But that's WHY there is two modes.
>
> There ARE some servers which do not respond properly to passive
> mode (mostly, they are also behind very restrictive firewalls). You'll
> find that you won't be able to talk to them through your firewall at all,
> since your firewall is blocking port mode connections and their firewall
> is blocking passive mode connections. You loose.
>
> > - Jeff
>
> > > -----Original Message-----
> > > From: Michael H. Warfield [mailto:">mhw@wittsend.com]
> > > Sent: Tuesday, February 22, 2000 4:42 PM
> > > To: Jeff Hubbs
> > > Cc: ">ale@ale.org
> > > Subject: Re: [ale] FTPing with a browser
> > >
> > >
> > > On Tue, Feb 22, 2000 at 04:43:17PM -0500, Jeff Hubbs wrote:
> > > > Can someone explain what is actually happening when one
> > > tries FTP with a Web
> > > > browser? Is the browser actually doing HTTP and a
> > > conversion takes place on
> > > > the server side? What's the real story?
> > >
> > > No. It understands the ftp protocol and is acting like an
> > > ftp client.
> > >
> > > > - Jeff
> > >
> > > Mike
> > > --
> > > Michael H. Warfield | (770) 985-6132 | ">mhw@WittsEnd.com
> > > (The Mad Wizard) | (770) 331-2437 |
> > > http://www.wittsend.com/mhw/
> > > NIC whois: MHW9 | An optimist believes we live in
> > > the best of all
> > > PGP Key: 0xDF1DD471 | possible worlds. A pessimist is
> > > sure of it!
> > >
>
> --
> Michael H. Warfield | (770) 985-6132 | ">mhw@WittsEnd.com
> (The Mad Wizard) | (770) 331-2437 | http://www.wittsend.com/mhw/
> NIC whois: MHW9 | An optimist believes we live in the best of all
> PGP Key: 0xDF1DD471 | possible worlds. A pessimist is sure of it!
>
> --
> To unsubscribe: mail ">majordomo@ale.org with "unsubscribe ale" in message body.
--
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Dow Hurst Office: 770-499-3428
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