From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jason Opperisano <opie@817west.com>
Subject: Re: Passive FTP Problem in NAT.
Date: Wed, 15 Sep 2004 11:43:50 -0400
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On Wed, 2004-09-15 at 11:13, svavar@atom01.is wrote:
> Hi.
> 
> Could someone help me or give me advice regarding NAT on a FTP server located in my DMZ.
> 
> This is my setup :
> 
> My Firewall(Linux 2.4.22-1) :
> |
> - eth0 = Public Interface (x.x.x.66 / 26 )
> |
> - eth1 = DMZ Interface (172.16.100.254 / 24 )
> |
> - eth2 = My Internal Network ( 192.168.1.1 / 24 )
> 
> 
> I have a FTP server located on my DMZ Network. The server is listening on a non-standard ftp port. It listens on port : 2121.

bingo.  the standard modprobe commands won't work in your situation. 
try:

        modprobe ip_conntrack_ftp ports=21,2121
        modprobe ip_nat_ftp ports=21,2121

to force the helper to watch your specific port.

-j

-- 
Jason Opperisano <opie@817west.com>