Date: Sat, 19 Feb 2000 20:32:04 -0500 From: "Crist J. Clark" <cjc@cc942873-a.ewndsr1.nj.home.com> To: Ivan Fetch <ivanfetch@technologist.com> Cc: cjclark@home.com, dc <admin@cyrebels.org>, questions@FreeBSD.ORG Subject: Re: Redirecting/mapping ports to a local machine... help! Message-ID: <20000219203204.G60348@cc942873-a.ewndsr1.nj.home.com> In-Reply-To: <Pine.LNX.4.20.0002191654380.1636-100000@ibis.ivanfetch.tzo.com>; from ivanfetch@technologist.com on Sat, Feb 19, 2000 at 04:56:20PM -0700 References: <20000219180014.B60348@cc942873-a.ewndsr1.nj.home.com> <Pine.LNX.4.20.0002191654380.1636-100000@ibis.ivanfetch.tzo.com>
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On Sat, Feb 19, 2000 at 04:56:20PM -0700, Ivan Fetch wrote:
> On Sat, 19 Feb 2000, Crist J. Clark wrote:
>
> > On Sat, Feb 19, 2000 at 11:15:32AM -0700, Ivan Fetch wrote:
> > > On Sat, 19 Feb 2000, dc wrote:
> > > > Hi,
> > > >
> > > > i've got 2 computers, 1 on freebsd, the other on windows. They are
> > > > sharing the net using natd. But i got a ftp server on port 42 of my
> > > > windows box, and i want to make it available from the outside... i tried
> > > > to do it with "redirect_port", here goes my natd.conf file:
> > > >
> > > >
> > > > ### Configuration file for Natd
> > > >
> > > > alias_address 24.226.185.143
> > > > redirect_port tcp 192.168.0.2:42 42
> > > > redirect_port udp 192.168.0.2:42 42
> > > >
> > > > ### End
> > > >
> > > >
> > > > then i launched "natd -conf /etc/natd.conf", both computers were sharing
> > > > the net as before, though i couldn't access the ftp server from the
> > > > outside.
> > > >
> > > > I can connect to the ftp server from the bsd box using the local ip
> > > > (19.168.0.2)....
> > >
> > > Hello,
> > > Your Windows FTP server does work on port 42:
> > > ftp your_Internet_IP 42
> > >
> > > Connected to u-serv FTP...
> > >
> > > I am not sure if this is why things were not working when you tedted them,
> > > but testing your ftp connection from inside your LAN (192.168.X.X) will
> > > not work. Maybe telnet to another machine on the Internet and then try
> > > FTPing back to your FreeBSD box for testing purposes.
> >
> > Doing FTP over a NAT box is problematic due to the two-channel nature
> > of FTP. As far as I know, NAT cannot fully support the FTP protocol.
>
> Although I have not had extensive use over a redirected FTP port, I have
> transfered a file or two and it has workked. I think the use of port 20
> (which is what I assume you are refering to below) is only used in
> certain kinds of transfers; certain FTP clients <?>.
^^^^^^^
This is a server issue not a client issue. An ftp client can do
passive ftp from behind a NAT box. However, active ftp would not
work.
Use of a control channel and a data channel is a basic part of the ftp
protocol. See RFC 959. Unimplemented RFC 2428 might be interesting too.
--
Crist J. Clark cjclark@home.com
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