You may want to take a look at this article :
http://forums.devshed.com/archive/31/2002/01/4/28475

As well as this link :
http://www.muine.org/~hoang/freenat.html

Taken from above link,

Network Address Translation rule:

For NAT and ftp clients behind NAT to work, add the following to
/etc/ipnat.rules: 

# Use ipfilter ftp proxy for ftp client transfers mode: active
map ep1 192.168.1.0/24 -> 0.0.0.0/32 proxy port ftp ftp/tcp

# Map all tcp and udp connections from 192.168.1.0/24 to external IP
address,
# changing the source port number to something between 40,000 and 60,000
inclusive
map ep1 192.168.1.0/24 -> 0.0.0.0/32 portmap tcp/udp 40000:60000

# For all other IP packets, map to the external IP address
map ep1 192.168.1.0/24 -> 0.0.0.0/32

Now I don't use FreeBSD as a firewall/nat box, I am an OpenBSD guy :)
The problem is cross platform, with OpenBSD setting up PF rules to proxy
ftp connections works well.

  Hope that helps,
    John

-----Original Message-----
From: Johnny [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, February 05, 2003 9:56 AM
To: NT 2000 Discussions
Subject: RE: FTP through firewalls


Hi,

Sorry I got so caught up in fixing this thing (people yelling - gnashing
of teeth etc) I forgot I already posted this problem.

I'm using freeBSD (ipf) and it seems that this cannot be done in either
passive or active mode.  My more recent port however (again - sorry) is
that there does seem to be some sort of patch for this but it hasn't been
released in a service pack yet.  Has anyone tried this/

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