can't transfer files via ftp

[yuri <kingofyuri@yahoo.com>]

 Dear all,

I use debian 3.1(sarge) as a router. I wrote a firewall script after I run this script all the pcs in my LAN can't transfer files from ftp server but I do allow ftp ports

$IPTABLES -A FORWARD -i $LAN_IFACE -o $INET_IFACE -s $LAN_IP_RANGE -d 0/0 -p tcp --dport 20 -j ACCEPT
$IPTABLES -A FORWARD -i $LAN_IFACE -o $INET_IFACE -s $LAN_IP_RANGE -d 0/0 -p tcp --dport 21 -j ACCEPT

I can connect to ftp server but I can't transfer. Do anyone give me an advise?
Thanks.

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