iptables

["Wan System S.R.L." <wansys@xxxxxxxxxxxx>]

I have installed a Red Hat 8.0 iptables 1.27a to make NAT. I have 2 net cards   
The computers of the internal net have MS Windows XP.  the www doesn't have any problem. When they try to make ftp it leaves the following error:   
200 ASCII tastes bad, dude.

500 Illegal PORT command.

500 Unknow command.

 

Please some tip

 

thank

 

wansys