Subject: Re: trying to ftp thru NAT box
To: adam johnson <>
From: Manuel Bouyer <>
List: tech-net
Date: 08/01/2001 17:15:02
On Tue, Jul 31, 2001 at 10:08:59PM -0700, adam johnson wrote:
> Hello!
> I'm running a NAT machine[C] for a few computers in my home.  It's worked 
> great except I've been unable to allow friend to ftp to my machine which is 
> behind the NAT box.  I can ftp almost all sites, but can not ftp other 
> computers behind routers/or other NAT boxes.
> Can this be done? Is it possible to set up a ftp server on my computer
> and expect access to other computers behind these types of ip translating 
> devices? Would it be wiser to place outgoing files on the NAT box itself and 

This is hard, given the ftp protocol itself (opens dynamic connections for
data transfers). This would require some kind of ftp proxy, but for 'rdr'
instead of 'map'

> then have it upload the file(s) to the friend's machine?  Thx for ANY input!

Yes, would be much easier !

Manuel Bouyer, LIP6, Universite Paris VI.