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[Reference:<_A2146@delegate-en.ML_>]
Newsgroups: mail-lists.delegate-en

[DeleGate-En] Re: Bug in FTP proxy
04 Mar 2003 16:58:18 GMT feedback@delegate.org (Yutaka Sato)


In message <_A2146@delegate-en.ML_> on 03/04/03(11:23:48)
you "Dameon D. Welch-Abernathy" <plueabdyi-bfsye37ngr5r.ml@ml.delegate.org> wrote:
 |Using Delegate 8.3.4 on Linux (local end) and FreeBSD (remote end)
 |
 |I have something set up similar to what is described on
 |http://www.delegate.org/delegate/ssh/, i.e. I have a local machine
 |running several specialist delegate proxies and a generalist that
 |tunnels using the TUNNEL directive:
 |
 |hosta% delegated -P4269 TUNNEL=tty7:ssh.shio SERVER=delegate
 |DGROOT=/home/dwelch/delegate
 |hosta% delegated -P2121 MASTER=127.0.0.1:4269 SERVER=ftp
 |DGROOT=/home/dwelch/delegate
 |
 |http and telnet work really well, but ftp (passive or active) seem to
 |have a problem in that data connections time out and go nowhere.
 |*However*, if I run delegate from a different host (say hostb) and do
 |all my FTP connections from through the other host, e.g.:
...
 |it works fine. ssh.shio is as the example except I use RES_NS in there
 |as well.
 |
 |Am I missing something here? Is this a bug?

Between FTP-DeleGate servers, FTP data is transmitted in "MODE XDC" 
which means transmitting data on the control-connection, without making
data-connections.  This mechanism prevents DeleGate from encountering
problems around data-connection.
This "MODE XDC" is suppressed when two DeleGate servers are on the
same machine, but can be enabled with the FTPCONF="forcexdc" option 
(which seems not documented)

Cheers,
Yutaka
--
  @ @ Yutaka Sato <y.sato@delegate.org> http://www.delegate.org/y.sato/
 ( - ) National Institute of Advanced Industrial Science and Technology (AIST)
_<   >_ 1-1-4 Umezono, Tsukuba, Ibaraki, 305-8568 Japan
Do the more with the less -- B. Fuller

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