NAT Problems FTP (maybe a newbie question)

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            Hi all, I've installed Slackware 9.1 in 2 diferent pc's, in 2 different clients. These machines are doing nat to all the internal network. I'm running only a single rule described below, but when any of the client machines try to connect to any ftp site, the connection was ok but when the user gives an ls command the server respond 500 ilegal command.
 
            I've checked all the modules (one of the machines are running with all the iptables code compiled internally into the kernel, not as module) and all is ok.
 
            What is poosible to happening in this case, could anybody give some hint!
 
            Thak's!
 
All my firewall is:
 
iptables -F
iptables -t nat -F
 
iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -d 0.0.0.0/0 -j SNAT --to 200.X.X.X
           
------------------------------------------------------
Francisco André Barbosa Neto
fneto@xxxxxxxxxxxxxxxx
Connect On Internet Provider
http://www.connecton.com.br
Fone: 55-11-4655-2232
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