Way to tell ftp-proxy to use a secondary proxy?

[Rob <rob_(_at_)_olg_(_dot_)_com>]

Hi,
is there any way to get the ftp-proxy(8) program to
use a secondary proxy?  In other words, I'd like to:


ftp_client -> ftp-proxy -> another_ftp_proxy -> out


I have two applications for this:


1) I have a network with it's own firewalls that is
   inside a much larger network with it's own
   firewalls.  While I can setup a transparent
   proxy for the lan firewalls, the systems inside
   the lan would still have to be configured to
   specify the external proxy (which is not
   transparent).


2) For stand-alone machines, I'd like to exploit
   the fact that pf can filter based on the
   uid and thus I could filter based on the
   ftp-proxy program holding the open ftp port.


Thanks for the replies,
Rob