FTP trought firewall (inverse)

[Paulo Henrique Baptista de Oliveira]

        Hi all,
        I have a box acting a firewall and forwarded 20 and 21 ports to inside.
        I can ftp to FIREWALL but can do ls and transfer dirs or files. I load
ipmasq_ftp and ipmasq_portfw modules, but no way.
        
        ipmasqadm portfw -a -P tcp -L $FIREWALL 20 -R $INTERNAL 20
        ipmasqadm portfw -a -P tcp -L $FIREWALL 21 -R $INTERNAL 21

        Any help is apreciated. Thanks,         Paulo Henrique